1261278 has 16 divisors (see below), whose sum is σ = 2802960. Its totient is φ = 420408.

The previous prime is 1261261. The next prime is 1261279. The reversal of 1261278 is 8721621.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11625 + ... + 11732.

It is an arithmetic number, because the mean of its divisors is an integer number (175185).

2^1261278 is an apocalyptic number.

1261278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1261278 is an abundant number, since it is smaller than the sum of its proper divisors (1541682).

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

1261278 is a wasteful number, since it uses less digits than its factorization.

1261278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23368 (or 23362 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 1261278 is about 1123.0663382009. The cubic root of 1261278 is about 108.0447345544.

Adding to 1261278 its reverse (8721621), we get a palindrome (9982899).

It can be divided in two parts, 126 and 1278, that multiplied together give a triangular number (161028 = T₅₆₇).

The spelling of 1261278 in words is "one million, two hundred sixty-one thousand, two hundred seventy-eight".