128440379 has 2 divisors, whose sum is σ = 128440380. Its totient is φ = 128440378.

The previous prime is 128440369. The next prime is 128440397. The reversal of 128440379 is 973044821.

Together with next prime (128440397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128440379 - 2¹⁶ = 128374843 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a pancake number, because a pancake can be divided into 128440379 parts by 16027 straight cuts.

It is not a weakly prime, because it can be changed into another prime (128440369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64220189 + 64220190.

It is an arithmetic number, because the mean of its divisors is an integer number (64220190).

Almost surely, 2^128440379 is an apocalyptic number.

128440379 is a deficient number, since it is larger than the sum of its proper divisors (1).

128440379 is an equidigital number, since it uses as much as digits as its factorization.

128440379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 128440379 is about 11333.1539740709. The cubic root of 128440379 is about 504.5457196251.

The spelling of 128440379 in words is "one hundred twenty-eight million, four hundred forty thousand, three hundred seventy-nine".