138386860 has 48 divisors (see below), whose sum is σ = 308448000. Its totient is φ = 52040384.

The previous prime is 138386839. The next prime is 138386863. The reversal of 138386860 is 68683831.

It is not an unprimeable number, because it can be changed into a prime (138386863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24591 + ... + 29689.

It is an arithmetic number, because the mean of its divisors is an integer number (6426000).

Almost surely, 2^138386860 is an apocalyptic number.

138386860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138386860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (154224000).

138386860 is an abundant number, since it is smaller than the sum of its proper divisors (170061140).

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

138386860 is a wasteful number, since it uses less digits than its factorization.

138386860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5190 (or 5188 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 138386860 is about 11763.7944558718. The cubic root of 138386860 is about 517.2473628192.

The spelling of 138386860 in words is "one hundred thirty-eight million, three hundred eighty-six thousand, eight hundred sixty".