138609030 has 64 divisors (see below), whose sum is σ = 390481920. Its totient is φ = 30824064.

The previous prime is 138609013. The next prime is 138609049. The reversal of 138609030 is 30906831.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1150 + ... + 16689.

It is an arithmetic number, because the mean of its divisors is an integer number (6101280).

Almost surely, 2^138609030 is an apocalyptic number.

138609030 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 138609030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195240960).

138609030 is an abundant number, since it is smaller than the sum of its proper divisors (251872890).

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

138609030 is a wasteful number, since it uses less digits than its factorization.

138609030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17893.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 138609030 is about 11773.2336254744. The cubic root of 138609030 is about 517.5240157820.

The spelling of 138609030 in words is "one hundred thirty-eight million, six hundred nine thousand, thirty".