128739379 has 2 divisors, whose sum is σ = 128739380. Its totient is φ = 128739378.

The previous prime is 128739367. The next prime is 128739389. The reversal of 128739379 is 973937821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128739379 - 2²¹ = 126642227 is a prime.

It is not a weakly prime, because it can be changed into another prime (128739389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64369689 + 64369690.

It is an arithmetic number, because the mean of its divisors is an integer number (64369690).

Almost surely, 2^128739379 is an apocalyptic number.

128739379 is a deficient number, since it is larger than the sum of its proper divisors (1).

128739379 is an equidigital number, since it uses as much as digits as its factorization.

128739379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 49.

The square root of 128739379 is about 11346.3376910790. The cubic root of 128739379 is about 504.9369316396.

The spelling of 128739379 in words is "one hundred twenty-eight million, seven hundred thirty-nine thousand, three hundred seventy-nine".