1256911434 has 12 divisors (see below), whose sum is σ = 2723308146. Its totient is φ = 418970472.

The previous prime is 1256911433. The next prime is 1256911471. The reversal of 1256911434 is 4341196521.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1159198209 + 97713225 = 34047^2 + 9885^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1256911433) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34914189 + ... + 34914224.

Almost surely, 2^1256911434 is an apocalyptic number.

1256911434 is an abundant number, since it is smaller than the sum of its proper divisors (1466396712).

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

1256911434 is a wasteful number, since it uses less digits than its factorization.

1256911434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69828421 (or 69828418 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 1256911434 is about 35452.9467604598. The cubic root of 1256911434 is about 1079.1990615129.

The spelling of 1256911434 in words is "one billion, two hundred fifty-six million, nine hundred eleven thousand, four hundred thirty-four".