669992 has 16 divisors (see below), whose sum is σ = 1271700. Its totient is φ = 330880.

The previous prime is 669989. The next prime is 670001. The reversal of 669992 is 299966.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 662596 + 7396 = 814^2 + 86^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669992.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242 + ... + 1182.

2⁶⁶⁹⁹⁹² is an apocalyptic number.

It is an amenable number.

669992 is a deficient number, since it is larger than the sum of its proper divisors (601708).

669992 is a wasteful number, since it uses less digits than its factorization.

669992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036 (or 1032 counting only the distinct ones).

The product of its digits is 52488, while the sum is 41.

The square root of 669992 is about 818.5303903949. The cubic root of 669992 is about 87.5030529547.

It can be divided in two parts, 669 and 992, that added together give a palindrome (1661).

The spelling of 669992 in words is "six hundred sixty-nine thousand, nine hundred ninety-two".