139489379 has 2 divisors, whose sum is σ = 139489380. Its totient is φ = 139489378.

The previous prime is 139489331. The next prime is 139489417. The reversal of 139489379 is 973984931.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139489379 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139489379.

It is not a weakly prime, because it can be changed into another prime (139489309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69744689 + 69744690.

It is an arithmetic number, because the mean of its divisors is an integer number (69744690).

Almost surely, 2^139489379 is an apocalyptic number.

139489379 is a deficient number, since it is larger than the sum of its proper divisors (1).

139489379 is an equidigital number, since it uses as much as digits as its factorization.

139489379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 53.

The square root of 139489379 is about 11810.5621796763. The cubic root of 139489379 is about 518.6173562443.

The spelling of 139489379 in words is "one hundred thirty-nine million, four hundred eighty-nine thousand, three hundred seventy-nine".