1257135874 has 32 divisors (see below), whose sum is σ = 2061607680. Its totient is φ = 572905872.

The previous prime is 1257135829. The next prime is 1257135883. The reversal of 1257135874 is 4785317521.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 1257135874.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 103737 + ... + 115219.

It is an arithmetic number, because the mean of its divisors is an integer number (64425240).

Almost surely, 2^1257135874 is an apocalyptic number.

1257135874 is a deficient number, since it is larger than the sum of its proper divisors (804471806).

1257135874 is a wasteful number, since it uses less digits than its factorization.

1257135874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11614.

The product of its digits is 235200, while the sum is 43.

The square root of 1257135874 is about 35456.1119413847. Note that the first 3 decimals coincide. The cubic root of 1257135874 is about 1079.2632933050.

The spelling of 1257135874 in words is "one billion, two hundred fifty-seven million, one hundred thirty-five thousand, eight hundred seventy-four".