138692620 has 72 divisors (see below), whose sum is σ = 322826112. Its totient is φ = 50012160.

The previous prime is 138692611. The next prime is 138692633. The reversal of 138692620 is 26296831.

It is a self number, because there is not a number n which added to its sum of digits gives 138692620.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 539532 + ... + 539788.

It is an arithmetic number, because the mean of its divisors is an integer number (4483696).

Almost surely, 2^138692620 is an apocalyptic number.

138692620 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 138692620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161413056).

138692620 is an abundant number, since it is smaller than the sum of its proper divisors (184133492).

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

138692620 is a wasteful number, since it uses less digits than its factorization.

138692620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 138692620 is about 11776.7830921691. The cubic root of 138692620 is about 517.6280280994.

The spelling of 138692620 in words is "one hundred thirty-eight million, six hundred ninety-two thousand, six hundred twenty".