163681738 has 16 divisors (see below), whose sum is σ = 268440480. Its totient is φ = 74234800.

The previous prime is 163681723. The next prime is 163681807. The reversal of 163681738 is 837186361.

It is a super-2 number, since 2×163681738² = 53583422709401288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 163681694 and 163681703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2073 + ... + 18211.

It is an arithmetic number, because the mean of its divisors is an integer number (16777530).

Almost surely, 2^163681738 is an apocalyptic number.

163681738 is a deficient number, since it is larger than the sum of its proper divisors (104758742).

163681738 is a wasteful number, since it uses less digits than its factorization.

163681738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16613.

The product of its digits is 145152, while the sum is 43.

The square root of 163681738 is about 12793.8163969943. The cubic root of 163681738 is about 547.0160585375.

The spelling of 163681738 in words is "one hundred sixty-three million, six hundred eighty-one thousand, seven hundred thirty-eight".