899920 has 40 divisors (see below), whose sum is σ = 2392704. Its totient is φ = 308352.

The previous prime is 899917. The next prime is 899939. The reversal of 899920 is 29998.

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 899920.

It is a congruent number.

It is an unprimeable number.

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, 244 + ... + 1363.

2⁸⁹⁹⁹²⁰ is an apocalyptic number.

899920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

899920 is an abundant number, since it is smaller than the sum of its proper divisors (1492784).

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

899920 is a wasteful number, since it uses less digits than its factorization.

899920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627 (or 1621 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 899920 is about 948.6411334114. The cubic root of 899920 is about 96.5460776665.

The spelling of 899920 in words is "eight hundred ninety-nine thousand, nine hundred twenty".