138989953 has 8 divisors (see below), whose sum is σ = 144026280. Its totient is φ = 133969920.

The previous prime is 138989927. The next prime is 138989971. The reversal of 138989953 is 359989831.

It can be written as a sum of positive squares in 4 ways, for example, as 88962624 + 50027329 = 9432^2 + 7073^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138989953 - 2⁹ = 138989441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138989894 and 138989903.

It is not an unprimeable number, because it can be changed into a prime (138989923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14851 + ... + 22327.

It is an arithmetic number, because the mean of its divisors is an integer number (18003285).

Almost surely, 2^138989953 is an apocalyptic number.

It is an amenable number.

138989953 is a deficient number, since it is larger than the sum of its proper divisors (5036327).

138989953 is an equidigital number, since it uses as much as digits as its factorization.

138989953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8147.

The product of its digits is 2099520, while the sum is 55.

The square root of 138989953 is about 11789.4000271430. The cubic root of 138989953 is about 517.9976657468.

The spelling of 138989953 in words is "one hundred thirty-eight million, nine hundred eighty-nine thousand, nine hundred fifty-three".