138858860 has 48 divisors (see below), whose sum is σ = 338929920. Its totient is φ = 46799040.

The previous prime is 138858857. The next prime is 138858869. The reversal of 138858860 is 68858831.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (138858869) 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, 146 + ... + 16665.

It is an arithmetic number, because the mean of its divisors is an integer number (7061040).

Almost surely, 2^138858860 is an apocalyptic number.

138858860 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 138858860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169464960).

138858860 is an abundant number, since it is smaller than the sum of its proper divisors (200071060).

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

138858860 is a wasteful number, since it uses less digits than its factorization.

138858860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16886 (or 16884 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 47.

The square root of 138858860 is about 11783.8389330472. The cubic root of 138858860 is about 517.8347589396.

The spelling of 138858860 in words is "one hundred thirty-eight million, eight hundred fifty-eight thousand, eight hundred sixty".