669402 has 12 divisors (see below), whose sum is σ = 1450410. Its totient is φ = 223128.

The previous prime is 669401. The next prime is 669413. The reversal of 669402 is 204966.

It can be written as a sum of positive squares in only one way, i.e., 447561 + 221841 = 669^2 + 471^2 .

It is not an unprimeable number, because it can be changed into a prime (669401) 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 5 ways as a sum of consecutive naturals, for example, 18577 + ... + 18612.

2⁶⁶⁹⁴⁰² is an apocalyptic number.

669402 is an abundant number, since it is smaller than the sum of its proper divisors (781008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669402 is a wasteful number, since it uses less digits than its factorization.

669402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37197 (or 37194 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 669402 is about 818.1699090042. The cubic root of 669402 is about 87.4773601290.

The spelling of 669402 in words is "six hundred sixty-nine thousand, four hundred two".