1538927857 has 16 divisors (see below), whose sum is σ = 1652472000. Its totient is φ = 1428793344.

The previous prime is 1538927851. The next prime is 1538927869. The reversal of 1538927857 is 7587298351.

It is a cyclic number.

It is not a de Polignac number, because 1538927857 - 2⁷ = 1538927729 is a prime.

It is a super-2 number, since 2×1538927857² = 4736597898101224898, which contains 22 as substring.

Its product of digits (4233600) is a multiple of the sum of its prime divisors (4320).

It is a junction number, because it is equal to n+sod(n) for n = 1538927798 and 1538927807.

It is not an unprimeable number, because it can be changed into a prime (1538927851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 393769 + ... + 397657.

It is an arithmetic number, because the mean of its divisors is an integer number (103279500).

Almost surely, 2^1538927857 is an apocalyptic number.

It is an amenable number.

1538927857 is a deficient number, since it is larger than the sum of its proper divisors (113544143).

1538927857 is a wasteful number, since it uses less digits than its factorization.

1538927857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4320.

The product of its digits is 4233600, while the sum is 55.

The square root of 1538927857 is about 39229.1709955742. The cubic root of 1538927857 is about 1154.5322986582.

The spelling of 1538927857 in words is "one billion, five hundred thirty-eight million, nine hundred twenty-seven thousand, eight hundred fifty-seven".