64405139 has 2 divisors, whose sum is σ = 64405140. Its totient is φ = 64405138.

The previous prime is 64405127. The next prime is 64405147. The reversal of 64405139 is 93150446.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64405139 - 2⁸ = 64404883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64405109) 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, 32202569 + 32202570.

It is an arithmetic number, because the mean of its divisors is an integer number (32202570).

Almost surely, 2^64405139 is an apocalyptic number.

64405139 is a deficient number, since it is larger than the sum of its proper divisors (1).

64405139 is an equidigital number, since it uses as much as digits as its factorization.

64405139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 64405139 is about 8025.2812411778. The cubic root of 64405139 is about 400.8422648135.

The spelling of 64405139 in words is "sixty-four million, four hundred five thousand, one hundred thirty-nine".