669499 has 4 divisors (see below), whose sum is σ = 675864. Its totient is φ = 663136.

The previous prime is 669481. The next prime is 669527. The reversal of 669499 is 994966.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 669499 - 2⁷ = 669371 is a prime.

It is a super-2 number, since 2×669499² = 896457822002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3022 + ... + 3235.

It is an arithmetic number, because the mean of its divisors is an integer number (168966).

2⁶⁶⁹⁴⁹⁹ is an apocalyptic number.

669499 is a deficient number, since it is larger than the sum of its proper divisors (6365).

669499 is a wasteful number, since it uses less digits than its factorization.

669499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6364.

The product of its digits is 104976, while the sum is 43.

The square root of 669499 is about 818.2291854976. The cubic root of 669499 is about 87.4815852405.

The spelling of 669499 in words is "six hundred sixty-nine thousand, four hundred ninety-nine".