138562818 has 16 divisors (see below), whose sum is σ = 293427360. Its totient is φ = 43470656.

The previous prime is 138562807. The next prime is 138562847. The reversal of 138562818 is 818265831.

It is a super-2 number, since 2×138562818² = 38399309064202248, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138562818.

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, 679128 + ... + 679331.

It is an arithmetic number, because the mean of its divisors is an integer number (18339210).

Almost surely, 2^138562818 is an apocalyptic number.

138562818 is an abundant number, since it is smaller than the sum of its proper divisors (154864542).

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

138562818 is a wasteful number, since it uses less digits than its factorization.

138562818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358481.

The product of its digits is 92160, while the sum is 42.

The square root of 138562818 is about 11771.2708744638. The cubic root of 138562818 is about 517.4664955321.

The spelling of 138562818 in words is "one hundred thirty-eight million, five hundred sixty-two thousand, eight hundred eighteen".