1256385236 has 12 divisors (see below), whose sum is σ = 2269599360. Its totient is φ = 607928280.

The previous prime is 1256385227. The next prime is 1256385239. The reversal of 1256385236 is 6325836521.

It is a super-2 number, since 2×1256385236² = 3157007722477551392, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 1256385193 and 1256385202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256385239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5065946 + ... + 5066193.

It is an arithmetic number, because the mean of its divisors is an integer number (189133280).

Almost surely, 2^1256385236 is an apocalyptic number.

It is an amenable number.

1256385236 is a deficient number, since it is larger than the sum of its proper divisors (1013214124).

1256385236 is a wasteful number, since it uses less digits than its factorization.

1256385236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10132174 (or 10132172 counting only the distinct ones).

The product of its digits is 259200, while the sum is 41.

The square root of 1256385236 is about 35445.5249079485. The cubic root of 1256385236 is about 1079.0484405446.

The spelling of 1256385236 in words is "one billion, two hundred fifty-six million, three hundred eighty-five thousand, two hundred thirty-six".