138989493 has 16 divisors (see below), whose sum is σ = 206740800. Its totient is φ = 92286000.

The previous prime is 138989471. The next prime is 138989509. The reversal of 138989493 is 394989831.

138989493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138989493 - 2⁶ = 138989429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138989443) 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, 3478 + ... + 17031.

It is an arithmetic number, because the mean of its divisors is an integer number (12921300).

Almost surely, 2^138989493 is an apocalyptic number.

It is an amenable number.

138989493 is a deficient number, since it is larger than the sum of its proper divisors (67751307).

138989493 is a wasteful number, since it uses less digits than its factorization.

138989493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20769 (or 20763 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 138989493 is about 11789.3805180764. The cubic root of 138989493 is about 517.9970942926.

The spelling of 138989493 in words is "one hundred thirty-eight million, nine hundred eighty-nine thousand, four hundred ninety-three".