138304908 has 72 divisors (see below), whose sum is σ = 414365952. Its totient is φ = 39513744.

The previous prime is 138304897. The next prime is 138304913. The reversal of 138304908 is 809403831.

138304908 is a `hidden beast` number, since 138 + 30 + 490 + 8 = 666.

138304908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3360 + ... + 16967.

Almost surely, 2^138304908 is an apocalyptic number.

138304908 is a gapful number since it is divisible by the number (18) 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 138304908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207182976).

138304908 is an abundant number, since it is smaller than the sum of its proper divisors (276061044).

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

138304908 is a wasteful number, since it uses less digits than its factorization.

138304908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20353 (or 20339 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 138304908 is about 11760.3107101811. The cubic root of 138304908 is about 517.1452388982.

The spelling of 138304908 in words is "one hundred thirty-eight million, three hundred four thousand, nine hundred eight".