138817437 has 16 divisors (see below), whose sum is σ = 202341888. Its totient is φ = 83954480.

The previous prime is 138817433. The next prime is 138817447. The reversal of 138817437 is 734718831.

It is a happy number.

138817437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 138817437 - 2² = 138817433 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138817433) 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, 12418 + ... + 20780.

It is an arithmetic number, because the mean of its divisors is an integer number (12646368).

Almost surely, 2^138817437 is an apocalyptic number.

It is an amenable number.

138817437 is a deficient number, since it is larger than the sum of its proper divisors (63524451).

138817437 is a wasteful number, since it uses less digits than its factorization.

138817437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8880.

The product of its digits is 112896, while the sum is 42.

The square root of 138817437 is about 11782.0811828811. The cubic root of 138817437 is about 517.7832620395.

The spelling of 138817437 in words is "one hundred thirty-eight million, eight hundred seventeen thousand, four hundred thirty-seven".