138289935 has 64 divisors (see below), whose sum is σ = 262056960. Its totient is φ = 60963840.

The previous prime is 138289913. The next prime is 138289939. The reversal of 138289935 is 539982831.

It is a happy number.

It is not a de Polignac number, because 138289935 - 2⁷ = 138289807 is a prime.

It is a super-2 number, since 2×138289935² = 38248212244608450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138289939) 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 63 ways as a sum of consecutive naturals, for example, 491995 + ... + 492275.

It is an arithmetic number, because the mean of its divisors is an integer number (4094640).

Almost surely, 2^138289935 is an apocalyptic number.

138289935 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138289935 is a deficient number, since it is larger than the sum of its proper divisors (123767025).

138289935 is a wasteful number, since it uses less digits than its factorization.

138289935 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448.

The product of its digits is 466560, while the sum is 48.

The square root of 138289935 is about 11759.6741026272. The cubic root of 138289935 is about 517.1265760390.

The spelling of 138289935 in words is "one hundred thirty-eight million, two hundred eighty-nine thousand, nine hundred thirty-five".