138450790 has 16 divisors (see below), whose sum is σ = 249781968. Its totient is φ = 55253536.

The previous prime is 138450779. The next prime is 138450791. The reversal of 138450790 is 97054831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138450791) 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 7 ways as a sum of consecutive naturals, for example, 11197 + ... + 20056.

It is an arithmetic number, because the mean of its divisors is an integer number (15611373).

Almost surely, 2^138450790 is an apocalyptic number.

138450790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138450790 is a deficient number, since it is larger than the sum of its proper divisors (111331178).

138450790 is a wasteful number, since it uses less digits than its factorization.

138450790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31703.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 138450790 is about 11766.5113776344. The cubic root of 138450790 is about 517.3270007587.

The spelling of 138450790 in words is "one hundred thirty-eight million, four hundred fifty thousand, seven hundred ninety".