138795690 has 32 divisors (see below), whose sum is σ = 363393216. Its totient is φ = 33647360.

The previous prime is 138795673. The next prime is 138795691. The reversal of 138795690 is 96597831.

It is a super-4 number, since 4×138795690⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (138795691) 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 15 ways as a sum of consecutive naturals, for example, 209967 + ... + 210626.

It is an arithmetic number, because the mean of its divisors is an integer number (11356038).

Almost surely, 2^138795690 is an apocalyptic number.

138795690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138795690 is an abundant number, since it is smaller than the sum of its proper divisors (224597526).

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

138795690 is a wasteful number, since it uses less digits than its factorization.

138795690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420614.

The product of its (nonzero) digits is 408240, while the sum is 48.

The square root of 138795690 is about 11781.1582622423. The cubic root of 138795690 is about 517.7562221592.

The spelling of 138795690 in words is "one hundred thirty-eight million, seven hundred ninety-five thousand, six hundred ninety".