166400904 has 16 divisors (see below), whose sum is σ = 416002320. Its totient is φ = 55466960.

The previous prime is 166400903. The next prime is 166400909. The reversal of 166400904 is 409004661.

It is not an unprimeable number, because it can be changed into a prime (166400903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3466662 + ... + 3466709.

It is an arithmetic number, because the mean of its divisors is an integer number (26000145).

Almost surely, 2^166400904 is an apocalyptic number.

It is an amenable number.

166400904 is an abundant number, since it is smaller than the sum of its proper divisors (249601416).

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

166400904 is a wasteful number, since it uses less digits than its factorization.

166400904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6933380 (or 6933376 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 166400904 is about 12899.6474370426. The cubic root of 166400904 is about 550.0285428713.

The spelling of 166400904 in words is "one hundred sixty-six million, four hundred thousand, nine hundred four".