1288278 has 16 divisors (see below), whose sum is σ = 2862960. Its totient is φ = 429408.

The previous prime is 1288249. The next prime is 1288291. The reversal of 1288278 is 8728821.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11875 + ... + 11982.

It is an arithmetic number, because the mean of its divisors is an integer number (178935).

2^1288278 is an apocalyptic number.

1288278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1288278 is an abundant number, since it is smaller than the sum of its proper divisors (1574682).

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

1288278 is a wasteful number, since it uses less digits than its factorization.

1288278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23868 (or 23862 counting only the distinct ones).

The product of its digits is 14336, while the sum is 36.

The square root of 1288278 is about 1135.0233477775. The cubic root of 1288278 is about 108.8102638637.

The spelling of 1288278 in words is "one million, two hundred eighty-eight thousand, two hundred seventy-eight".