138651590 has 64 divisors (see below), whose sum is σ = 324725760. Its totient is φ = 41331840.

The previous prime is 138651577. The next prime is 138651599. The reversal of 138651590 is 95156831.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138651599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13796 + ... + 21624.

It is an arithmetic number, because the mean of its divisors is an integer number (5073840).

Almost surely, 2^138651590 is an apocalyptic number.

138651590 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138651590 is an abundant number, since it is smaller than the sum of its proper divisors (186074170).

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

138651590 is a wasteful number, since it uses less digits than its factorization.

138651590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7877.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 138651590 is about 11775.0409765741. The cubic root of 138651590 is about 517.5769790657.

The spelling of 138651590 in words is "one hundred thirty-eight million, six hundred fifty-one thousand, five hundred ninety".