1557042734 has 16 divisors (see below), whose sum is σ = 2521575168. Its totient is φ = 716820192.

The previous prime is 1557042689. The next prime is 1557042749. The reversal of 1557042734 is 4372407551.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65102 + ... + 85745.

It is an arithmetic number, because the mean of its divisors is an integer number (157598448).

Almost surely, 2^1557042734 is an apocalyptic number.

1557042734 is a deficient number, since it is larger than the sum of its proper divisors (964532434).

1557042734 is a wasteful number, since it uses less digits than its factorization.

1557042734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151259.

The product of its (nonzero) digits is 117600, while the sum is 38.

The square root of 1557042734 is about 39459.3808111582. The cubic root of 1557042734 is about 1159.0446786783.

The spelling of 1557042734 in words is "one billion, five hundred fifty-seven million, forty-two thousand, seven hundred thirty-four".