138608310 has 64 divisors (see below), whose sum is σ = 353590272. Its totient is φ = 34653696.

The previous prime is 138608237. The next prime is 138608321. The reversal of 138608310 is 13806831.

It is a super-2 number, since 2×138608310² = 38424527202112200, which contains 22 as substring.

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, 235837 + ... + 236423.

It is an arithmetic number, because the mean of its divisors is an integer number (5524848).

Almost surely, 2^138608310 is an apocalyptic number.

138608310 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 138608310, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176795136).

138608310 is an abundant number, since it is smaller than the sum of its proper divisors (214981962).

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

138608310 is a wasteful number, since it uses less digits than its factorization.

138608310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 138608310 is about 11773.2030475992. The cubic root of 138608310 is about 517.5231196934.

The spelling of 138608310 in words is "one hundred thirty-eight million, six hundred eight thousand, three hundred ten".