7869988 has 18 divisors (see below), whose sum is σ = 16021446. Its totient is φ = 3372768.

The previous prime is 7869941. The next prime is 7870007. The reversal of 7869988 is 8899687.

It can be written as a sum of positive squares in only one way, i.e., 6853924 + 1016064 = 2618^2 + 1008^2 .

It is a super-2 number, since 2×7869988² = 123873422240288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19881 + ... + 20272.

Almost surely, 2^7869988 is an apocalyptic number.

It is an amenable number.

7869988 is an abundant number, since it is smaller than the sum of its proper divisors (8151458).

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

7869988 is a wasteful number, since it uses less digits than its factorization.

7869988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40171 (or 40162 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 55.

The square root of 7869988 is about 2805.3498890513. The cubic root of 7869988 is about 198.9106439565.

It can be divided in two parts, 78699 and 88, that added together give a palindrome (78787).

The spelling of 7869988 in words is "seven million, eight hundred sixty-nine thousand, nine hundred eighty-eight".