669384 has 40 divisors (see below), whose sum is σ = 1876710. Its totient is φ = 222912.

The previous prime is 669379. The next prime is 669391. The reversal of 669384 is 483966.

It can be written as a sum of positive squares in only one way, i.e., 396900 + 272484 = 630^2 + 522^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

669384 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 132 + ... + 1164.

2⁶⁶⁹³⁸⁴ 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 669384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938355).

669384 is an abundant number, since it is smaller than the sum of its proper divisors (1207326).

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

669384 is a wasteful number, since it uses less digits than its factorization.

669384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051 (or 1038 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 669384 is about 818.1589087702. The cubic root of 669384 is about 87.4765760428.

The spelling of 669384 in words is "six hundred sixty-nine thousand, three hundred eighty-four".