1257157486 has 32 divisors (see below), whose sum is σ = 2069867520. Its totient is φ = 569108064.

The previous prime is 1257157481. The next prime is 1257157487. The reversal of 1257157486 is 6847517521.

Its product of digits (470400) is a multiple of the sum of its prime divisors (1920).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257157481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1139211 + ... + 1140313.

It is an arithmetic number, because the mean of its divisors is an integer number (64683360).

Almost surely, 2^1257157486 is an apocalyptic number.

1257157486 is a deficient number, since it is larger than the sum of its proper divisors (812710034).

1257157486 is a wasteful number, since it uses less digits than its factorization.

1257157486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920.

The product of its digits is 470400, while the sum is 46.

The square root of 1257157486 is about 35456.4167112245. The cubic root of 1257157486 is about 1079.2694779731.

The spelling of 1257157486 in words is "one billion, two hundred fifty-seven million, one hundred fifty-seven thousand, four hundred eighty-six".