138013897 has 8 divisors (see below), whose sum is σ = 157968576. Its totient is φ = 118118832.

The previous prime is 138013879. The next prime is 138013901. The reversal of 138013897 is 798310831.

138013897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138013897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138013807) 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, 9823 + ... + 19300.

It is an arithmetic number, because the mean of its divisors is an integer number (19746072).

Almost surely, 2^138013897 is an apocalyptic number.

It is an amenable number.

138013897 is a deficient number, since it is larger than the sum of its proper divisors (19954679).

138013897 is an equidigital number, since it uses as much as digits as its factorization.

138013897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29807.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 138013897 is about 11747.9316051805. The cubic root of 138013897 is about 516.7822712294.

The spelling of 138013897 in words is "one hundred thirty-eight million, thirteen thousand, eight hundred ninety-seven".