1256237240 has 16 divisors (see below), whose sum is σ = 2826533880. Its totient is φ = 502494880.

The previous prime is 1256237239. The next prime is 1256237371. The reversal of 1256237240 is 427326521.

It is a junction number, because it is equal to n+sod(n) for n = 1256237197 and 1256237206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15702926 + ... + 15703005.

Almost surely, 2^1256237240 is an apocalyptic number.

1256237240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256237240 is an abundant number, since it is smaller than the sum of its proper divisors (1570296640).

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

1256237240 is a wasteful number, since it uses less digits than its factorization.

1256237240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31405942 (or 31405938 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 1256237240 is about 35443.4371922363. The cubic root of 1256237240 is about 1079.0060700149.

The spelling of 1256237240 in words is "one billion, two hundred fifty-six million, two hundred thirty-seven thousand, two hundred forty".