7899920 has 40 divisors (see below), whose sum is σ = 20992704. Its totient is φ = 2708352.

The previous prime is 7899911. The next prime is 7899929. The reversal of 7899920 is 299987.

It is an interprime number because it is at equal distance from previous prime (7899911) and next prime (7899929).

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

It is not an unprimeable number, because it can be changed into a prime (7899929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6494 + ... + 7613.

Almost surely, 2^7899920 is an apocalyptic number.

7899920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7899920 is an abundant number, since it is smaller than the sum of its proper divisors (13092784).

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

7899920 is a wasteful number, since it uses less digits than its factorization.

7899920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14127 (or 14121 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 7899920 is about 2810.6796331137. The cubic root of 7899920 is about 199.1624978460.

The spelling of 7899920 in words is "seven million, eight hundred ninety-nine thousand, nine hundred twenty".