138949393 has 12 divisors (see below), whose sum is σ = 155805552. Its totient is φ = 122890320.

The previous prime is 138949361. The next prime is 138949403. The reversal of 138949393 is 393949831.

It is not a de Polignac number, because 138949393 - 2⁵ = 138949361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138949193) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10446 + ... + 19672.

It is an arithmetic number, because the mean of its divisors is an integer number (12983796).

Almost surely, 2^138949393 is an apocalyptic number.

It is an amenable number.

138949393 is a deficient number, since it is larger than the sum of its proper divisors (16856159).

138949393 is an equidigital number, since it uses as much as digits as its factorization.

138949393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9312 (or 9275 counting only the distinct ones).

The product of its digits is 629856, while the sum is 49.

The square root of 138949393 is about 11787.6797123098. The cubic root of 138949393 is about 517.9472735448.

The spelling of 138949393 in words is "one hundred thirty-eight million, nine hundred forty-nine thousand, three hundred ninety-three".