138268836 has 24 divisors (see below), whose sum is σ = 358475040. Its totient is φ = 46089576.

The previous prime is 138268813. The next prime is 138268841. The reversal of 138268836 is 638862831.

It is a junction number, because it is equal to n+sod(n) for n = 138268791 and 138268800.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 640026 + ... + 640241.

It is an arithmetic number, because the mean of its divisors is an integer number (14936460).

Almost surely, 2^138268836 is an apocalyptic number.

It is an amenable number.

138268836 is an abundant number, since it is smaller than the sum of its proper divisors (220206204).

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

138268836 is a wasteful number, since it uses less digits than its factorization.

138268836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1280280 (or 1280272 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 138268836 is about 11758.7769772200. The cubic root of 138268836 is about 517.1002752370.

The spelling of 138268836 in words is "one hundred thirty-eight million, two hundred sixty-eight thousand, eight hundred thirty-six".