990815 has 8 divisors (see below), whose sum is σ = 1358880. Its totient is φ = 679392.

The previous prime is 990809. The next prime is 990841. The reversal of 990815 is 518099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 990815 - 2⁴ = 990799 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14120 + ... + 14189.

It is an arithmetic number, because the mean of its divisors is an integer number (169860).

2⁹⁹⁰⁸¹⁵ is an apocalyptic number.

990815 is a deficient number, since it is larger than the sum of its proper divisors (368065).

990815 is a wasteful number, since it uses less digits than its factorization.

990815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28321.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 990815 is about 995.3969057617. The cubic root of 990815 is about 99.6928911403.

The spelling of 990815 in words is "nine hundred ninety thousand, eight hundred fifteen".