1257867842 has 96 divisors (see below), whose sum is σ = 2592414720. Its totient is φ = 446054400.

The previous prime is 1257867841. The next prime is 1257867847. The reversal of 1257867842 is 2487687521.

It is not an unprimeable number, because it can be changed into a prime (1257867841) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 892034 + ... + 893442.

It is an arithmetic number, because the mean of its divisors is an integer number (27004320).

Almost surely, 2^1257867842 is an apocalyptic number.

1257867842 is an abundant number, since it is smaller than the sum of its proper divisors (1334546878).

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

1257867842 is a wasteful number, since it uses less digits than its factorization.

1257867842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1488 (or 1477 counting only the distinct ones).

The product of its digits is 1505280, while the sum is 50.

The square root of 1257867842 is about 35466.4326088768. The cubic root of 1257867842 is about 1079.4727198639.

The spelling of 1257867842 in words is "one billion, two hundred fifty-seven million, eight hundred sixty-seven thousand, eight hundred forty-two".