138959361 has 16 divisors (see below), whose sum is σ = 206166720. Its totient is φ = 92504160.

The previous prime is 138959351. The next prime is 138959363. The reversal of 138959361 is 163959831.

It is not a de Polignac number, because 138959361 - 2⁶ = 138959297 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138959363) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17166 + ... + 23928.

It is an arithmetic number, because the mean of its divisors is an integer number (12885420).

Almost surely, 2^138959361 is an apocalyptic number.

It is an amenable number.

138959361 is a deficient number, since it is larger than the sum of its proper divisors (67207359).

138959361 is an equidigital number, since it uses as much as digits as its factorization.

138959361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7533 (or 7527 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 138959361 is about 11788.1025190656. The cubic root of 138959361 is about 517.9596588093.

The spelling of 138959361 in words is "one hundred thirty-eight million, nine hundred fifty-nine thousand, three hundred sixty-one".