669372 has 36 divisors (see below), whose sum is σ = 1720488. Its totient is φ = 202400.

The previous prime is 669371. The next prime is 669377. The reversal of 669372 is 273966.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669371) 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 11 ways as a sum of consecutive naturals, for example, 1222 + ... + 1682.

669372 is a Friedman number, since it can be written as 6*((7^3-9)^2+6), using all its digits and the basic arithmetic operations.

2⁶⁶⁹³⁷² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669372, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (860244).

669372 is an abundant number, since it is smaller than the sum of its proper divisors (1051116).

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

669372 is a wasteful number, since it uses less digits than its factorization.

669372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490 (or 477 counting only the distinct ones).

The product of its digits is 13608, while the sum is 33.

The square root of 669372 is about 818.1515751986. The cubic root of 669372 is about 87.4760533109.

It can be divided in two parts, 6 and 69372, that added together give a triangular number (69378 = T₃₇₂).

The spelling of 669372 in words is "six hundred sixty-nine thousand, three hundred seventy-two".