1256797040 has 40 divisors (see below), whose sum is σ = 3016318848. Its totient is φ = 486501120.

The previous prime is 1256797033. The next prime is 1256797043. The reversal of 1256797040 is 407976521.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256797043) 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, 250907 + ... + 255866.

Almost surely, 2^1256797040 is an apocalyptic number.

1256797040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256797040 is an abundant number, since it is smaller than the sum of its proper divisors (1759521808).

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

1256797040 is a wasteful number, since it uses less digits than its factorization.

1256797040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506817 (or 506811 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 1256797040 is about 35451.3334022854. Note that the first 3 decimals coincide. The cubic root of 1256797040 is about 1079.1663205046.

The spelling of 1256797040 in words is "one billion, two hundred fifty-six million, seven hundred ninety-seven thousand, forty".