1256234840 has 32 divisors (see below), whose sum is σ = 3230318880. Its totient is φ = 430708992.

The previous prime is 1256234827. The next prime is 1256234893. The reversal of 1256234840 is 484326521.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1256234840.

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, 2242997 + ... + 2243556.

It is an arithmetic number, because the mean of its divisors is an integer number (100947465).

Almost surely, 2^1256234840 is an apocalyptic number.

1256234840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256234840 is an abundant number, since it is smaller than the sum of its proper divisors (1974084040).

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

1256234840 is a wasteful number, since it uses less digits than its factorization.

1256234840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4486571 (or 4486567 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 1256234840 is about 35443.4033354586. The cubic root of 1256234840 is about 1079.0053828793.

The spelling of 1256234840 in words is "one billion, two hundred fifty-six million, two hundred thirty-four thousand, eight hundred forty".