816516138 has 16 divisors (see below), whose sum is σ = 1635909120. Its totient is φ = 271692576.

The previous prime is 816516133. The next prime is 816516167. The reversal of 816516138 is 831615618.

It is a super-2 number, since 2×816516138² = 1333397207228870088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 816516096 and 816516105.

It is not an unprimeable number, because it can be changed into a prime (816516131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116170 + ... + 122997.

It is an arithmetic number, because the mean of its divisors is an integer number (102244320).

Almost surely, 2^816516138 is an apocalyptic number.

816516138 is an abundant number, since it is smaller than the sum of its proper divisors (819392982).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

816516138 is a wasteful number, since it uses less digits than its factorization.

816516138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239741.

The product of its digits is 34560, while the sum is 39.

The square root of 816516138 is about 28574.7465080620. The cubic root of 816516138 is about 934.6627275442.

The spelling of 816516138 in words is "eight hundred sixteen million, five hundred sixteen thousand, one hundred thirty-eight".