7904986 has 4 divisors (see below), whose sum is σ = 11857482. Its totient is φ = 3952492.

The previous prime is 7904959. The next prime is 7904987. The reversal of 7904986 is 6894097.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6095961 + 1809025 = 2469^2 + 1345^2 .

It is not an unprimeable number, because it can be changed into a prime (7904987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1976245 + ... + 1976248.

Almost surely, 2^7904986 is an apocalyptic number.

7904986 is a deficient number, since it is larger than the sum of its proper divisors (3952496).

7904986 is a wasteful number, since it uses less digits than its factorization.

7904986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3952495.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 7904986 is about 2811.5806942003. The cubic root of 7904986 is about 199.2050612145.

It can be divided in two parts, 790 and 4986, that added together give a square (5776 = 76²).

The spelling of 7904986 in words is "seven million, nine hundred four thousand, nine hundred eighty-six".