1256861942 has 8 divisors (see below), whose sum is σ = 2154620496. Its totient is φ = 538655112.

The previous prime is 1256861927. The next prime is 1256861953. The reversal of 1256861942 is 2491686521.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×1256861942² = 3159403882496022728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1256861893 and 1256861902.

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, 44887913 + ... + 44887940.

It is an arithmetic number, because the mean of its divisors is an integer number (269327562).

Almost surely, 2^1256861942 is an apocalyptic number.

1256861942 is a deficient number, since it is larger than the sum of its proper divisors (897758554).

1256861942 is an equidigital number, since it uses as much as digits as its factorization.

1256861942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89775862.

The product of its digits is 207360, while the sum is 44.

The square root of 1256861942 is about 35452.2487580125. The cubic root of 1256861942 is about 1079.1848965209.

The spelling of 1256861942 in words is "one billion, two hundred fifty-six million, eight hundred sixty-one thousand, nine hundred forty-two".