669974 has 4 divisors (see below), whose sum is σ = 1004964. Its totient is φ = 334986.

The previous prime is 669971. The next prime is 669989. The reversal of 669974 is 479966.

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

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 669974.

It is not an unprimeable number, because it can be changed into a prime (669971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167492 + ... + 167495.

It is an arithmetic number, because the mean of its divisors is an integer number (251241).

2⁶⁶⁹⁹⁷⁴ is an apocalyptic number.

669974 is a deficient number, since it is larger than the sum of its proper divisors (334990).

669974 is a wasteful number, since it uses less digits than its factorization.

669974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334989.

The product of its digits is 81648, while the sum is 41.

The square root of 669974 is about 818.5193950054. The cubic root of 669974 is about 87.5022693289.

The spelling of 669974 in words is "six hundred sixty-nine thousand, nine hundred seventy-four".