1664408 has 16 divisors (see below), whose sum is σ = 3205680. Its totient is φ = 809568.

The previous prime is 1664407. The next prime is 1664417. The reversal of 1664408 is 8044661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2516 + ... + 3107.

It is an arithmetic number, because the mean of its divisors is an integer number (200355).

2^1664408 is an apocalyptic number.

It is an amenable number.

1664408 is a deficient number, since it is larger than the sum of its proper divisors (1541272).

1664408 is a wasteful number, since it uses less digits than its factorization.

1664408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5666 (or 5662 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 1664408 is about 1290.1193743216. The cubic root of 1664408 is about 118.5095270281.

The spelling of 1664408 in words is "one million, six hundred sixty-four thousand, four hundred eight".