163938915 has 48 divisors (see below), whose sum is σ = 325660608. Its totient is φ = 74734848.

The previous prime is 163938913. The next prime is 163938941. The reversal of 163938915 is 519839361.

163938915 is a `hidden beast` number, since 1 + 639 + 3 + 8 + 9 + 1 + 5 = 666.

It is not a de Polignac number, because 163938915 - 2¹ = 163938913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (163938913) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 205297 + ... + 206093.

It is an arithmetic number, because the mean of its divisors is an integer number (6784596).

Almost surely, 2^163938915 is an apocalyptic number.

163938915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

163938915 is a deficient number, since it is larger than the sum of its proper divisors (161721693).

163938915 is a wasteful number, since it uses less digits than its factorization.

163938915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 1465 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 163938915 is about 12803.8632841811. The cubic root of 163938915 is about 547.3023994492.

The spelling of 163938915 in words is "one hundred sixty-three million, nine hundred thirty-eight thousand, nine hundred fifteen".