7989657 has 16 divisors (see below), whose sum is σ = 11524800. Its totient is φ = 4894272.

The previous prime is 7989649. The next prime is 7989679. The reversal of 7989657 is 7569897.

It is not a de Polignac number, because 7989657 - 2³ = 7989649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7989617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13318 + ... + 13904.

It is an arithmetic number, because the mean of its divisors is an integer number (720300).

Almost surely, 2^7989657 is an apocalyptic number.

It is an amenable number.

7989657 is a deficient number, since it is larger than the sum of its proper divisors (3535143).

7989657 is a wasteful number, since it uses less digits than its factorization.

7989657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952.

The product of its digits is 952560, while the sum is 51.

The square root of 7989657 is about 2826.5981320308. The cubic root of 7989657 is about 199.9137711616.

It can be divided in two parts, 7989 and 657, that added together give a triangular number (8646 = T₁₃₁).

The spelling of 7989657 in words is "seven million, nine hundred eighty-nine thousand, six hundred fifty-seven".