669442 has 4 divisors (see below), whose sum is σ = 1004166. Its totient is φ = 334720.

The previous prime is 669437. The next prime is 669451. The reversal of 669442 is 244966.

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

It can be written as a sum of positive squares in only one way, i.e., 408321 + 261121 = 639^2 + 511^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167359 + ... + 167362.

2⁶⁶⁹⁴⁴² is an apocalyptic number.

669442 is a deficient number, since it is larger than the sum of its proper divisors (334724).

669442 is a wasteful number, since it uses less digits than its factorization.

669442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334723.

The product of its digits is 10368, while the sum is 31.

The square root of 669442 is about 818.1943534393. The cubic root of 669442 is about 87.4791024925.

It can be divided in two parts, 669 and 442, that added together give a palindrome (1111).

The spelling of 669442 in words is "six hundred sixty-nine thousand, four hundred forty-two".