1257439023 has 6 divisors (see below), whose sum is σ = 1816300824. Its totient is φ = 838292676.

The previous prime is 1257438997. The next prime is 1257439087. The reversal of 1257439023 is 3209347521.

It is not a de Polignac number, because 1257439023 - 2²⁸ = 989003567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257439123) 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, 69857715 + ... + 69857732.

It is an arithmetic number, because the mean of its divisors is an integer number (302716804).

Almost surely, 2^1257439023 is an apocalyptic number.

1257439023 is a deficient number, since it is larger than the sum of its proper divisors (558861801).

1257439023 is a wasteful number, since it uses less digits than its factorization.

1257439023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139715453 (or 139715450 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 1257439023 is about 35460.3866730187. The cubic root of 1257439023 is about 1079.3500384478.

The spelling of 1257439023 in words is "one billion, two hundred fifty-seven million, four hundred thirty-nine thousand, twenty-three".