163921916 has 6 divisors (see below), whose sum is σ = 286863360. Its totient is φ = 81960956.

The previous prime is 163921907. The next prime is 163921931. The reversal of 163921916 is 619129361.

It is a super-2 number, since 2×163921916² = 53740789090222112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 163921916.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20490236 + ... + 20490243.

It is an arithmetic number, because the mean of its divisors is an integer number (47810560).

Almost surely, 2^163921916 is an apocalyptic number.

It is an amenable number.

163921916 is a deficient number, since it is larger than the sum of its proper divisors (122941444).

163921916 is a wasteful number, since it uses less digits than its factorization.

163921916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40980483 (or 40980481 counting only the distinct ones).

The product of its digits is 17496, while the sum is 38.

The square root of 163921916 is about 12803.1994438890. The cubic root of 163921916 is about 547.2834820066.

The spelling of 163921916 in words is "one hundred sixty-three million, nine hundred twenty-one thousand, nine hundred sixteen".