168138815 has 24 divisors (see below), whose sum is σ = 222616800. Its totient is φ = 121189824.

The previous prime is 168138791. The next prime is 168138829. The reversal of 168138815 is 518831861.

It is not a de Polignac number, because 168138815 - 2¹⁰ = 168137791 is a prime.

It is a super-2 number, since 2×168138815² = 56541322219208450, which contains 22 as substring.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 119486 + ... + 120884.

It is an arithmetic number, because the mean of its divisors is an integer number (9275700).

Almost surely, 2^168138815 is an apocalyptic number.

168138815 is a deficient number, since it is larger than the sum of its proper divisors (54477985).

168138815 is a wasteful number, since it uses less digits than its factorization.

168138815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503 (or 1460 counting only the distinct ones).

The product of its digits is 46080, while the sum is 41.

The square root of 168138815 is about 12966.8351959913. The cubic root of 168138815 is about 551.9367696512.

The spelling of 168138815 in words is "one hundred sixty-eight million, one hundred thirty-eight thousand, eight hundred fifteen".