1557843042 has 128 divisors (see below), whose sum is σ = 3914887680. Its totient is φ = 403107840.

The previous prime is 1557843037. The next prime is 1557843097. The reversal of 1557843042 is 2403487551.

1557843042 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2879292 + ... + 2879832.

It is an arithmetic number, because the mean of its divisors is an integer number (30585060).

Almost surely, 2^1557843042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1557843042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1957443840).

1557843042 is an abundant number, since it is smaller than the sum of its proper divisors (2357044638).

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

1557843042 is a wasteful number, since it uses less digits than its factorization.

1557843042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716.

The product of its (nonzero) digits is 134400, while the sum is 39.

The square root of 1557843042 is about 39469.5204176590. The cubic root of 1557843042 is about 1159.2432246845.

The spelling of 1557843042 in words is "one billion, five hundred fifty-seven million, eight hundred forty-three thousand, forty-two".