138840746 has 8 divisors (see below), whose sum is σ = 227193984. Its totient is φ = 63109420.

The previous prime is 138840731. The next prime is 138840749. The reversal of 138840746 is 647048831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (138840749) 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 3 ways as a sum of consecutive naturals, for example, 3155450 + ... + 3155493.

It is an arithmetic number, because the mean of its divisors is an integer number (28399248).

Almost surely, 2^138840746 is an apocalyptic number.

138840746 is a deficient number, since it is larger than the sum of its proper divisors (88353238).

138840746 is a wasteful number, since it uses less digits than its factorization.

138840746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6310956.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 138840746 is about 11783.0703129532. The cubic root of 138840746 is about 517.8122409509.

The spelling of 138840746 in words is "one hundred thirty-eight million, eight hundred forty thousand, seven hundred forty-six".