667394986 has 8 divisors (see below), whose sum is σ = 1001211300. Its totient is φ = 333657888.

The previous prime is 667394977. The next prime is 667395023. The reversal of 667394986 is 689493766.

It can be written as a sum of positive squares in 2 ways, for example, as 651831961 + 15563025 = 25531^2 + 3945^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 667394986.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10590 + ... + 38038.

Almost surely, 2^667394986 is an apocalyptic number.

667394986 is a deficient number, since it is larger than the sum of its proper divisors (333816314).

667394986 is a wasteful number, since it uses less digits than its factorization.

667394986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39608.

The product of its digits is 11757312, while the sum is 58.

The square root of 667394986 is about 25833.9889680243. The cubic root of 667394986 is about 873.8984717299.

The spelling of 667394986 in words is "six hundred sixty-seven million, three hundred ninety-four thousand, nine hundred eighty-six".