138608835 has 16 divisors (see below), whose sum is σ = 229422240. Its totient is φ = 71375360.

The previous prime is 138608807. The next prime is 138608839. The reversal of 138608835 is 538806831.

It is not a de Polignac number, because 138608835 - 2⁷ = 138608707 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (138608839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158886 + ... + 159755.

It is an arithmetic number, because the mean of its divisors is an integer number (14338890).

Almost surely, 2^138608835 is an apocalyptic number.

138608835 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138608835 is a deficient number, since it is larger than the sum of its proper divisors (90813405).

138608835 is a wasteful number, since it uses less digits than its factorization.

138608835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318678.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 138608835 is about 11773.2253439744. The cubic root of 138608835 is about 517.5237730916.

The spelling of 138608835 in words is "one hundred thirty-eight million, six hundred eight thousand, eight hundred thirty-five".