138630390 has 32 divisors (see below), whose sum is σ = 333227520. Its totient is φ = 36910944.

The previous prime is 138630347. The next prime is 138630433. The reversal of 138630390 is 93036831.

138630390 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (138630347) and next prime (138630433).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 18357 + ... + 24783.

It is an arithmetic number, because the mean of its divisors is an integer number (10413360).

Almost surely, 2^138630390 is an apocalyptic number.

138630390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138630390 is an abundant number, since it is smaller than the sum of its proper divisors (194597130).

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

138630390 is a wasteful number, since it uses less digits than its factorization.

138630390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7156.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 138630390 is about 11774.1407329792. The cubic root of 138630390 is about 517.5505983339.

The spelling of 138630390 in words is "one hundred thirty-eight million, six hundred thirty thousand, three hundred ninety".