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BaseRepresentation
bin10011111110
31202100
4103332
520103
65530
73504
oct2376
91670
101278
11a62
128a6
13774
14674
155a3
hex4fe

1278 has 12 divisors (see below), whose sum is σ = 2808. Its totient is φ = 420.

The previous prime is 1277. The next prime is 1279. The reversal of 1278 is 8721.

Adding to 1278 its sum of digits (18), we get a 4-th power (1296 = 64).

Adding to 1278 its reverse (8721), we get a palindrome (9999).

It is an interprime number because it is at equal distance from previous prime (1277) and next prime (1279).

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 71 = 1278 / (1 + 2 + 7 + 8).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a plaindrome in base 10.

It is a nialpdrome in base 6, base 11 and base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 1278.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1277) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18 + ... + 53.

It is an arithmetic number, because the mean of its divisors is an integer number (234).

1278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1278 is an abundant number, since it is smaller than the sum of its proper divisors (1530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278 is a wasteful number, since it uses less digits than its factorization.

1278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79 (or 76 counting only the distinct ones).

The product of its digits is 112, while the sum is 18.

The square root of 1278 is about 35.7491258634. The cubic root of 1278 is about 10.8520124818.

The spelling of 1278 in words is "one thousand, two hundred seventy-eight".

Divisors: 1 2 3 6 9 18 71 142 213 426 639 1278