138813705 has 12 divisors (see below), whose sum is σ = 240610500. Its totient is φ = 74033952.

The previous prime is 138813673. The next prime is 138813799. The reversal of 138813705 is 507318831.

It can be written as a sum of positive squares in 2 ways, for example, as 84879369 + 53934336 = 9213^2 + 7344^2 .

It is not a de Polignac number, because 138813705 - 2⁵ = 138813673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138813705.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1542330 + ... + 1542419.

It is an arithmetic number, because the mean of its divisors is an integer number (20050875).

Almost surely, 2^138813705 is an apocalyptic number.

138813705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138813705 is a deficient number, since it is larger than the sum of its proper divisors (101796795).

138813705 is a wasteful number, since it uses less digits than its factorization.

138813705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3084760 (or 3084757 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 138813705 is about 11781.9228057223. The cubic root of 138813705 is about 517.7786219297.

The spelling of 138813705 in words is "one hundred thirty-eight million, eight hundred thirteen thousand, seven hundred five".