999457557 has 96 divisors (see below), whose sum is σ = 1716194304. Its totient is φ = 513676800.

The previous prime is 999457549. The next prime is 999457573. The reversal of 999457557 is 755754999.

It is not a de Polignac number, because 999457557 - 2³ = 999457549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999457557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999457757) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7629382 + ... + 7629512.

It is an arithmetic number, because the mean of its divisors is an integer number (17877024).

Almost surely, 2^999457557 is an apocalyptic number.

It is an amenable number.

999457557 is a deficient number, since it is larger than the sum of its proper divisors (716736747).

999457557 is a wasteful number, since it uses less digits than its factorization.

999457557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 272 counting only the distinct ones).

The product of its digits is 17860500, while the sum is 60.

The square root of 999457557 is about 31614.1986613610. The cubic root of 999457557 is about 999.8191529630.

The spelling of 999457557 in words is "nine hundred ninety-nine million, four hundred fifty-seven thousand, five hundred fifty-seven".