138151836 has 36 divisors (see below), whose sum is σ = 351455832. Its totient is φ = 45755424.

The previous prime is 138151817. The next prime is 138151859. The reversal of 138151836 is 638151831.

138151836 is a `hidden beast` number, since 138 + 1 + 518 + 3 + 6 = 666.

138151836 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

138151836 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 138151836.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6570 + ... + 17873.

It is an arithmetic number, because the mean of its divisors is an integer number (9762662).

Almost surely, 2^138151836 is an apocalyptic number.

It is an amenable number.

138151836 is an abundant number, since it is smaller than the sum of its proper divisors (213303996).

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

138151836 is a wasteful number, since it uses less digits than its factorization.

138151836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24610 (or 24605 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 138151836 is about 11753.8009171502. The cubic root of 138151836 is about 516.9543811784.

It can be divided in two parts, 13815 and 1836, that added together give a palindrome (15651).

The spelling of 138151836 in words is "one hundred thirty-eight million, one hundred fifty-one thousand, eight hundred thirty-six".