138836620 has 96 divisors (see below), whose sum is σ = 336825216. Its totient is φ = 47616000.

The previous prime is 138836611. The next prime is 138836623. The reversal of 138836620 is 26638831.

It is a self number, because there is not a number n which added to its sum of digits gives 138836620.

It is not an unprimeable number, because it can be changed into a prime (138836623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 446265 + ... + 446575.

It is an arithmetic number, because the mean of its divisors is an integer number (3508596).

Almost surely, 2^138836620 is an apocalyptic number.

138836620 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 138836620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168412608).

138836620 is an abundant number, since it is smaller than the sum of its proper divisors (197988596).

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

138836620 is a wasteful number, since it uses less digits than its factorization.

138836620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451 (or 449 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 138836620 is about 11782.8952299509. The cubic root of 138836620 is about 517.8071115382.

It can be divided in two parts, 13883 and 6620, that added together give a triangular number (20503 = T₂₀₂).

The spelling of 138836620 in words is "one hundred thirty-eight million, eight hundred thirty-six thousand, six hundred twenty".