139405389 has 16 divisors (see below), whose sum is σ = 199184832. Its totient is φ = 86413568.

The previous prime is 139405373. The next prime is 139405397. The reversal of 139405389 is 983504931.

It is a cyclic number.

It is not a de Polignac number, because 139405389 - 2⁴ = 139405373 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 139405389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139405319) 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, 12234 + ... + 20699.

It is an arithmetic number, because the mean of its divisors is an integer number (12449052).

Almost surely, 2^139405389 is an apocalyptic number.

It is an amenable number.

139405389 is a deficient number, since it is larger than the sum of its proper divisors (59779443).

139405389 is a wasteful number, since it uses less digits than its factorization.

139405389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33036.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 139405389 is about 11807.0059286849. The cubic root of 139405389 is about 518.5132445726.

The spelling of 139405389 in words is "one hundred thirty-nine million, four hundred five thousand, three hundred eighty-nine".