1255640 has 16 divisors (see below), whose sum is σ = 2825280. Its totient is φ = 502240.

The previous prime is 1255633. The next prime is 1255651. The reversal of 1255640 is 465521.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15656 + ... + 15735.

It is an arithmetic number, because the mean of its divisors is an integer number (176580).

2^1255640 is an apocalyptic number.

1255640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1255640 is an abundant number, since it is smaller than the sum of its proper divisors (1569640).

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

1255640 is a wasteful number, since it uses less digits than its factorization.

1255640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31402 (or 31398 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1255640 is about 1120.5534346920. The cubic root of 1255640 is about 107.8835049310.

The spelling of 1255640 in words is "one million, two hundred fifty-five thousand, six hundred forty".