138801860 has 24 divisors (see below), whose sum is σ = 292020120. Its totient is φ = 55418624.

The previous prime is 138801853. The next prime is 138801863. The reversal of 138801860 is 68108831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8248384 + 130553476 = 2872^2 + 11426^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 138801860.

It is not an unprimeable number, because it can be changed into a prime (138801863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5282 + ... + 17478.

It is an arithmetic number, because the mean of its divisors is an integer number (12167505).

Almost surely, 2^138801860 is an apocalyptic number.

138801860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138801860 is an abundant number, since it is smaller than the sum of its proper divisors (153218260).

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

138801860 is a wasteful number, since it uses less digits than its factorization.

138801860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12775 (or 12773 counting only the distinct ones).

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

The square root of 138801860 is about 11781.4201181352. The cubic root of 138801860 is about 517.7638941279.

The spelling of 138801860 in words is "one hundred thirty-eight million, eight hundred one thousand, eight hundred sixty".