138606930 has 256 divisors, whose sum is σ = 472780800. Its totient is φ = 28062720.

The previous prime is 138606917. The next prime is 138606943. The reversal of 138606930 is 39606831.

It is a happy number.

138606930 is a `hidden beast` number, since 13 + 8 + 606 + 9 + 30 = 666.

It is an interprime number because it is at equal distance from previous prime (138606917) and next prime (138606943).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1226554 + ... + 1226666.

It is an arithmetic number, because the mean of its divisors is an integer number (1846800).

Almost surely, 2^138606930 is an apocalyptic number.

138606930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138606930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236390400).

138606930 is an abundant number, since it is smaller than the sum of its proper divisors (334173870).

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

138606930 is a wasteful number, since it uses less digits than its factorization.

138606930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 138606930 is about 11773.1444397833. The cubic root of 138606930 is about 517.5214021814.

Subtracting from 138606930 its reverse (39606831), we obtain a palindrome (99000099).

The spelling of 138606930 in words is "one hundred thirty-eight million, six hundred six thousand, nine hundred thirty".