163939401 has 12 divisors (see below), whose sum is σ = 236969460. Its totient is φ = 109215360.

The previous prime is 163939367. The next prime is 163939417. The reversal of 163939401 is 104939361.

163939401 is a `hidden beast` number, since 163 + 93 + 9 + 401 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 92621376 + 71318025 = 9624^2 + 8445^2 .

It is not a de Polignac number, because 163939401 - 2¹⁸ = 163677257 is a prime.

It is a super-2 number, since 2×163939401² = 53752254400477602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163919401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8821 + ... + 20141.

It is an arithmetic number, because the mean of its divisors is an integer number (19747455).

Almost surely, 2^163939401 is an apocalyptic number.

It is an amenable number.

163939401 is a deficient number, since it is larger than the sum of its proper divisors (73030059).

163939401 is a wasteful number, since it uses less digits than its factorization.

163939401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12936 (or 12933 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 163939401 is about 12803.8822628139. The cubic root of 163939401 is about 547.3029402781.

The spelling of 163939401 in words is "one hundred sixty-three million, nine hundred thirty-nine thousand, four hundred one".