990057 has 4 divisors (see below), whose sum is σ = 1320080. Its totient is φ = 660036.

The previous prime is 990053. The next prime is 990137. The reversal of 990057 is 750099.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 990057 - 2² = 990053 is a prime.

It is a D-number.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990057.

It is not an unprimeable number, because it can be changed into a prime (990053) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165007 + ... + 165012.

It is an arithmetic number, because the mean of its divisors is an integer number (330020).

2⁹⁹⁰⁰⁵⁷ is an apocalyptic number.

It is an amenable number.

990057 is a deficient number, since it is larger than the sum of its proper divisors (330023).

990057 is a wasteful number, since it uses less digits than its factorization.

990057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330022.

The product of its (nonzero) digits is 2835, while the sum is 30.

The square root of 990057 is about 995.0160802721. The cubic root of 990057 is about 99.6674620777.

The spelling of 990057 in words is "nine hundred ninety thousand, fifty-seven".