138699790 has 16 divisors (see below), whose sum is σ = 249796512. Its totient is φ = 55449504.

The previous prime is 138699767. The next prime is 138699793. The reversal of 138699790 is 97996831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138699793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28087 + ... + 32653.

It is an arithmetic number, because the mean of its divisors is an integer number (15612282).

Almost surely, 2^138699790 is an apocalyptic number.

138699790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138699790 is a deficient number, since it is larger than the sum of its proper divisors (111096722).

138699790 is a wasteful number, since it uses less digits than its factorization.

138699790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7611.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 138699790 is about 11777.0875007363. The cubic root of 138699790 is about 517.6369478939.

The spelling of 138699790 in words is "one hundred thirty-eight million, six hundred ninety-nine thousand, seven hundred ninety".