138361620 has 24 divisors (see below), whose sum is σ = 387412704. Its totient is φ = 36896416.

The previous prime is 138361579. The next prime is 138361621. The reversal of 138361620 is 26163831.

138361620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138361621) 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, 1152954 + ... + 1153073.

It is an arithmetic number, because the mean of its divisors is an integer number (16142196).

Almost surely, 2^138361620 is an apocalyptic number.

138361620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138361620 is an abundant number, since it is smaller than the sum of its proper divisors (249051084).

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

138361620 is a wasteful number, since it uses less digits than its factorization.

138361620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2306039 (or 2306037 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 138361620 is about 11762.7216238420. The cubic root of 138361620 is about 517.2159144643.

The spelling of 138361620 in words is "one hundred thirty-eight million, three hundred sixty-one thousand, six hundred twenty".