138637730 has 64 divisors (see below), whose sum is σ = 312595200. Its totient is φ = 43008000.

The previous prime is 138637729. The next prime is 138637739. The reversal of 138637730 is 37736831.

It is a happy number.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (138637739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 308546 + ... + 308994.

It is an arithmetic number, because the mean of its divisors is an integer number (4884300).

Almost surely, 2^138637730 is an apocalyptic number.

138637730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138637730 is an abundant number, since it is smaller than the sum of its proper divisors (173957470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138637730 is a wasteful number, since it uses less digits than its factorization.

138637730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 875.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 138637730 is about 11774.4524288818. The cubic root of 138637730 is about 517.5597323445.

The spelling of 138637730 in words is "one hundred thirty-eight million, six hundred thirty-seven thousand, seven hundred thirty".