836520138 has 24 divisors (see below), whose sum is σ = 1874960100. Its totient is φ = 269224704.

The previous prime is 836520133. The next prime is 836520193. The reversal of 836520138 is 831025638.

It can be written as a sum of positive squares in 2 ways, for example, as 728838009 + 107682129 = 26997^2 + 10377^2 .

It is not an unprimeable number, because it can be changed into a prime (836520133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 800743 + ... + 801786.

Almost surely, 2^836520138 is an apocalyptic number.

836520138 is an abundant number, since it is smaller than the sum of its proper divisors (1038439962).

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

836520138 is a wasteful number, since it uses less digits than its factorization.

836520138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602566 (or 1602563 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 836520138 is about 28922.6578654176. The cubic root of 836520138 is about 942.2340622204.

The spelling of 836520138 in words is "eight hundred thirty-six million, five hundred twenty thousand, one hundred thirty-eight".