1256216424 has 16 divisors (see below), whose sum is σ = 3140541120. Its totient is φ = 418738800.

The previous prime is 1256216413. The next prime is 1256216443. The reversal of 1256216424 is 4246126521.

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, 26171152 + ... + 26171199.

It is an arithmetic number, because the mean of its divisors is an integer number (196283820).

Almost surely, 2^1256216424 is an apocalyptic number.

It is an amenable number.

1256216424 is an abundant number, since it is smaller than the sum of its proper divisors (1884324696).

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

1256216424 is a wasteful number, since it uses less digits than its factorization.

1256216424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52342360 (or 52342356 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 1256216424 is about 35443.1435400417. The cubic root of 1256216424 is about 1079.0001102292. Note that the first 3 decimals are identical.

The spelling of 1256216424 in words is "one billion, two hundred fifty-six million, two hundred sixteen thousand, four hundred twenty-four".