1256745436 has 24 divisors (see below), whose sum is σ = 2234916320. Its totient is φ = 618276672.

The previous prime is 1256745409. The next prime is 1256745437. The reversal of 1256745436 is 6345476521.

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 = 1256745392 and 1256745401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256745437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54970 + ... + 74398.

Almost surely, 2^1256745436 is an apocalyptic number.

It is an amenable number.

1256745436 is a deficient number, since it is larger than the sum of its proper divisors (978170884).

1256745436 is a wasteful number, since it uses less digits than its factorization.

1256745436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19693 (or 19691 counting only the distinct ones).

The product of its digits is 604800, while the sum is 43.

The square root of 1256745436 is about 35450.6055801590. The cubic root of 1256745436 is about 1079.1515501375.

The spelling of 1256745436 in words is "one billion, two hundred fifty-six million, seven hundred forty-five thousand, four hundred thirty-six".