163904409 has 24 divisors (see below), whose sum is σ = 245236992. Its totient is φ = 105377760.

The previous prime is 163904359. The next prime is 163904443. The reversal of 163904409 is 904409361.

163904409 is a `hidden beast` number, since 163 + 90 + 4 + 409 = 666.

It is not a de Polignac number, because 163904409 - 2⁹ = 163903897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163904459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95967 + ... + 97659.

It is an arithmetic number, because the mean of its divisors is an integer number (10218208).

Almost surely, 2^163904409 is an apocalyptic number.

It is an amenable number.

163904409 is a deficient number, since it is larger than the sum of its proper divisors (81332583).

163904409 is a wasteful number, since it uses less digits than its factorization.

163904409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2077 (or 2074 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 163904409 is about 12802.5157293401. The cubic root of 163904409 is about 547.2639978658.

The spelling of 163904409 in words is "one hundred sixty-three million, nine hundred four thousand, four hundred nine".