64843939 has 2 divisors, whose sum is σ = 64843940. Its totient is φ = 64843938.

The previous prime is 64843921. The next prime is 64843949. The reversal of 64843939 is 93934846.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64843939 - 2⁵ = 64843907 is a prime.

It is not a weakly prime, because it can be changed into another prime (64843949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32421969 + 32421970.

It is an arithmetic number, because the mean of its divisors is an integer number (32421970).

Almost surely, 2^64843939 is an apocalyptic number.

64843939 is a deficient number, since it is larger than the sum of its proper divisors (1).

64843939 is an equidigital number, since it uses as much as digits as its factorization.

64843939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 46.

The square root of 64843939 is about 8052.5734395906. The cubic root of 64843939 is about 401.7505341499.

The spelling of 64843939 in words is "sixty-four million, eight hundred forty-three thousand, nine hundred thirty-nine".