163928905 has 16 divisors (see below), whose sum is σ = 225768960. Its totient is φ = 111932352.

The previous prime is 163928893. The next prime is 163928911. The reversal of 163928905 is 509829361.

It is a happy number.

163928905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 163928905 - 2²¹ = 161831753 is a prime.

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, 1434 + ... + 18163.

It is an arithmetic number, because the mean of its divisors is an integer number (14110560).

Almost surely, 2^163928905 is an apocalyptic number.

It is an amenable number.

163928905 is a deficient number, since it is larger than the sum of its proper divisors (61840055).

163928905 is a wasteful number, since it uses less digits than its factorization.

163928905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19848.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 163928905 is about 12803.4723805693. The cubic root of 163928905 is about 547.2912599169.

The spelling of 163928905 in words is "one hundred sixty-three million, nine hundred twenty-eight thousand, nine hundred five".