990620 has 12 divisors (see below), whose sum is σ = 2080344. Its totient is φ = 396240.

The previous prime is 990599. The next prime is 990631. The reversal of 990620 is 26099.

It is a self number, because there is not a number n which added to its sum of digits gives 990620.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990620.

It is an unprimeable number.

990620 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24746 + ... + 24785.

It is an arithmetic number, because the mean of its divisors is an integer number (173362).

2⁹⁹⁰⁶²⁰ is an apocalyptic number.

It is an amenable number.

990620 is an abundant number, since it is smaller than the sum of its proper divisors (1089724).

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

990620 is a wasteful number, since it uses less digits than its factorization.

990620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49540 (or 49538 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 990620 is about 995.2989500648. The cubic root of 990620 is about 99.6863506024.

The spelling of 990620 in words is "nine hundred ninety thousand, six hundred twenty".