990920 has 32 divisors (see below), whose sum is σ = 2548800. Its totient is φ = 339648.

The previous prime is 990917. The next prime is 990923. The reversal of 990920 is 29099.

It is an interprime number because it is at equal distance from previous prime (990917) and next prime (990923).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990920.

It is not an unprimeable number, because it can be changed into a prime (990923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1490 + ... + 2049.

It is an arithmetic number, because the mean of its divisors is an integer number (79650).

2⁹⁹⁰⁹²⁰ is an apocalyptic number.

It is an amenable number.

990920 is an abundant number, since it is smaller than the sum of its proper divisors (1557880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

990920 is a wasteful number, since it uses less digits than its factorization.

990920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3557 (or 3553 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 29.

The square root of 990920 is about 995.4496471444. The cubic root of 990920 is about 99.6964126130.

The spelling of 990920 in words is "nine hundred ninety thousand, nine hundred twenty".