7981659 has 30 divisors (see below), whose sum is σ = 13876764. Its totient is φ = 4558680.

The previous prime is 7981639. The next prime is 7981661. The reversal of 7981659 is 9561897.

It is not a de Polignac number, because 7981659 - 2⁵ = 7981627 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7981639) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 2964 + ... + 4974.

Almost surely, 2^7981659 is an apocalyptic number.

7981659 is a deficient number, since it is larger than the sum of its proper divisors (5895105).

7981659 is a wasteful number, since it uses less digits than its factorization.

7981659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037 (or 2021 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 7981659 is about 2825.1830029221. The cubic root of 7981659 is about 199.8470413815.

The spelling of 7981659 in words is "seven million, nine hundred eighty-one thousand, six hundred fifty-nine".