138232390 has 32 divisors (see below), whose sum is σ = 254077920. Its totient is φ = 54134784.

The previous prime is 138232373. The next prime is 138232399. The reversal of 138232390 is 93232831.

138232390 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138232390² = 38216387290224200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138232399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128776 + ... + 129844.

It is an arithmetic number, because the mean of its divisors is an integer number (7939935).

Almost surely, 2^138232390 is an apocalyptic number.

138232390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138232390 is a deficient number, since it is larger than the sum of its proper divisors (115845530).

138232390 is a wasteful number, since it uses less digits than its factorization.

138232390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 138232390 is about 11757.2271390834. The cubic root of 138232390 is about 517.0548374428.

The spelling of 138232390 in words is "one hundred thirty-eight million, two hundred thirty-two thousand, three hundred ninety".