999957 has 16 divisors (see below), whose sum is σ = 1613952. Its totient is φ = 537600.

The previous prime is 999953. The next prime is 999959. The reversal of 999957 is 759999.

999957 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 999957 - 2² = 999953 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999953) 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, 1044 + ... + 1757.

It is an arithmetic number, because the mean of its divisors is an integer number (100872).

2⁹⁹⁹⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

999957 is a deficient number, since it is larger than the sum of its proper divisors (613995).

999957 is a wasteful number, since it uses less digits than its factorization.

999957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828.

The product of its digits is 229635, while the sum is 48.

The square root of 999957 is about 999.9784997689. The cubic root of 999957 is about 99.9985666461.

The spelling of 999957 in words is "nine hundred ninety-nine thousand, nine hundred fifty-seven".