669400 has 24 divisors (see below), whose sum is σ = 1556820. Its totient is φ = 267680.

The previous prime is 669391. The next prime is 669401. The reversal of 669400 is 4966.

669400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669401) by changing a digit.

669400 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 5 ways as a sum of consecutive naturals, for example, 1474 + ... + 1873.

2⁶⁶⁹⁴⁰⁰ is an apocalyptic number.

It is an amenable number.

669400 is an abundant number, since it is smaller than the sum of its proper divisors (887420).

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

669400 is a wasteful number, since it uses less digits than its factorization.

669400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3363 (or 3354 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 669400 is about 818.1686867633. The cubic root of 669400 is about 87.4772730090.

The spelling of 669400 in words is "six hundred sixty-nine thousand, four hundred".