138044730 has 32 divisors (see below), whose sum is σ = 332103744. Its totient is φ = 36723456.

The previous prime is 138044717. The next prime is 138044761. The reversal of 138044730 is 37440831.

138044730 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7677 + ... + 18303.

It is an arithmetic number, because the mean of its divisors is an integer number (10378242).

Almost surely, 2^138044730 is an apocalyptic number.

138044730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

138044730 is an abundant number, since it is smaller than the sum of its proper divisors (194059014).

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

138044730 is a wasteful number, since it uses less digits than its factorization.

138044730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11070.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 138044730 is about 11749.2438054540. The cubic root of 138044730 is about 516.8207522850.

The spelling of 138044730 in words is "one hundred thirty-eight million, forty-four thousand, seven hundred thirty".