138945387 has 8 divisors (see below), whose sum is σ = 211726336. Its totient is φ = 79397352.

The previous prime is 138945371. The next prime is 138945431. The reversal of 138945387 is 783549831.

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

It is not a de Polignac number, because 138945387 - 2⁴ = 138945371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138945307) 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 7 ways as a sum of consecutive naturals, for example, 3308203 + ... + 3308244.

It is an arithmetic number, because the mean of its divisors is an integer number (26465792).

Almost surely, 2^138945387 is an apocalyptic number.

138945387 is a deficient number, since it is larger than the sum of its proper divisors (72780949).

138945387 is an equidigital number, since it uses as much as digits as its factorization.

138945387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6616457.

The product of its digits is 725760, while the sum is 48.

The square root of 138945387 is about 11787.5097879069. The cubic root of 138945387 is about 517.9422959131.

The spelling of 138945387 in words is "one hundred thirty-eight million, nine hundred forty-five thousand, three hundred eighty-seven".