163856406 has 32 divisors (see below), whose sum is σ = 380125440. Its totient is φ = 46116576.

The previous prime is 163856389. The next prime is 163856411. The reversal of 163856406 is 604658361.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26301 + ... + 31928.

It is an arithmetic number, because the mean of its divisors is an integer number (11878920).

Almost surely, 2^163856406 is an apocalyptic number.

163856406 is an abundant number, since it is smaller than the sum of its proper divisors (216269034).

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

163856406 is a wasteful number, since it uses less digits than its factorization.

163856406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58308.

The product of its (nonzero) digits is 103680, while the sum is 39.

The square root of 163856406 is about 12800.6408433328. The cubic root of 163856406 is about 547.2105665622.

It can be divided in two parts, 16385 and 6406, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 163856406 in words is "one hundred sixty-three million, eight hundred fifty-six thousand, four hundred six".