138770915 has 8 divisors (see below), whose sum is σ = 176320800. Its totient is φ = 104486272.

The previous prime is 138770903. The next prime is 138770917. The reversal of 138770915 is 519077831.

138770915 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 not a de Polignac number, because 138770915 - 2⁴ = 138770899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138770917) 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, 816215 + ... + 816384.

It is an arithmetic number, because the mean of its divisors is an integer number (22040100).

Almost surely, 2^138770915 is an apocalyptic number.

138770915 is a deficient number, since it is larger than the sum of its proper divisors (37549885).

138770915 is a wasteful number, since it uses less digits than its factorization.

138770915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632621.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 138770915 is about 11780.1067482430. The cubic root of 138770915 is about 517.7254138690.

The spelling of 138770915 in words is "one hundred thirty-eight million, seven hundred seventy thousand, nine hundred fifteen".