138732018 has 32 divisors (see below), whose sum is σ = 291610176. Its totient is φ = 43944768.

The previous prime is 138732001. The next prime is 138732049. The reversal of 138732018 is 810237831.

It is a self number, because there is not a number n which added to its sum of digits gives 138732018.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2280 + ... + 16812.

It is an arithmetic number, because the mean of its divisors is an integer number (9112818).

Almost surely, 2^138732018 is an apocalyptic number.

138732018 is an abundant number, since it is smaller than the sum of its proper divisors (152878158).

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

138732018 is a wasteful number, since it uses less digits than its factorization.

138732018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14618.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 138732018 is about 11778.4556712669. The cubic root of 138732018 is about 517.6770371438.

Adding to 138732018 its reverse (810237831), we get a palindrome (948969849).

The spelling of 138732018 in words is "one hundred thirty-eight million, seven hundred thirty-two thousand, eighteen".