138165730 has 16 divisors (see below), whose sum is σ = 248875704. Its totient is φ = 55226880.

The previous prime is 138165721. The next prime is 138165737. The reversal of 138165730 is 37561831.

138165730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 95433361 + 42732369 = 9769^2 + 6537^2 .

It is not an unprimeable number, because it can be changed into a prime (138165737) 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, 12850 + ... + 21010.

Almost surely, 2^138165730 is an apocalyptic number.

138165730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138165730 is a deficient number, since it is larger than the sum of its proper divisors (110709974).

138165730 is a wasteful number, since it uses less digits than its factorization.

138165730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9861.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 138165730 is about 11754.3919451412. The cubic root of 138165730 is about 516.9717107186.

The spelling of 138165730 in words is "one hundred thirty-eight million, one hundred sixty-five thousand, seven hundred thirty".