138018860 has 48 divisors (see below), whose sum is σ = 345655296. Its totient is φ = 45262272.

The previous prime is 138018847. The next prime is 138018871. The reversal of 138018860 is 68810831.

It is a happy number.

138018860 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (35).

138018860 is a modest number, since divided by 18860 gives 1380 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 138018860.

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, 18212 + ... + 24651.

It is an arithmetic number, because the mean of its divisors is an integer number (7201152).

Almost surely, 2^138018860 is an apocalyptic number.

138018860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138018860 is an abundant number, since it is smaller than the sum of its proper divisors (207636436).

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

138018860 is a wasteful number, since it uses less digits than its factorization.

138018860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42902 (or 42900 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 138018860 is about 11748.1428319543. The cubic root of 138018860 is about 516.7884656773.

The spelling of 138018860 in words is "one hundred thirty-eight million, eighteen thousand, eight hundred sixty".