320691986 has 4 divisors (see below), whose sum is σ = 481037982. Its totient is φ = 160345992.

The previous prime is 320691983. The next prime is 320692007. The reversal of 320691986 is 689196023.

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., 271425625 + 49266361 = 16475^2 + 7019^2 .

It is not an unprimeable number, because it can be changed into a prime (320691983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80172995 + ... + 80172998.

Almost surely, 2^320691986 is an apocalyptic number.

320691986 is a deficient number, since it is larger than the sum of its proper divisors (160345996).

320691986 is a wasteful number, since it uses less digits than its factorization.

320691986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160345995.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 320691986 is about 17907.8749716431. The cubic root of 320691986 is about 684.4830567993.

The spelling of 320691986 in words is "three hundred twenty million, six hundred ninety-one thousand, nine hundred eighty-six".