669915 has 12 divisors (see below), whose sum is σ = 1161264. Its totient is φ = 357264.

The previous prime is 669913. The next prime is 669923. The reversal of 669915 is 519966.

It is not a de Polignac number, because 669915 - 2¹ = 669913 is a prime.

It is a super-2 number, since 2×669915² = 897572214450, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 669915.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669915.

It is not an unprimeable number, because it can be changed into a prime (669913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7399 + ... + 7488.

It is an arithmetic number, because the mean of its divisors is an integer number (96772).

2⁶⁶⁹⁹¹⁵ is an apocalyptic number.

669915 is a deficient number, since it is larger than the sum of its proper divisors (491349).

669915 is a wasteful number, since it uses less digits than its factorization.

669915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14898 (or 14895 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 669915 is about 818.4833535265. The cubic root of 669915 is about 87.4997006792.

The spelling of 669915 in words is "six hundred sixty-nine thousand, nine hundred fifteen".