1664920 has 32 divisors (see below), whose sum is σ = 3790800. Its totient is φ = 658048.

The previous prime is 1664909. The next prime is 1664941. The reversal of 1664920 is 294661.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4086 + ... + 4474.

2^1664920 is an apocalyptic number.

1664920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1664920 is an abundant number, since it is smaller than the sum of its proper divisors (2125880).

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

1664920 is a wasteful number, since it uses less digits than its factorization.

1664920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507 (or 503 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1664920 is about 1290.3177903137. The cubic root of 1664920 is about 118.5216776261.

The spelling of 1664920 in words is "one million, six hundred sixty-four thousand, nine hundred twenty".