646993934 has 16 divisors (see below), whose sum is σ = 976577472. Its totient is φ = 321474048.

The previous prime is 646993891. The next prime is 646993937. The reversal of 646993934 is 439399646.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646993937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312587 + ... + 314649.

It is an arithmetic number, because the mean of its divisors is an integer number (61036092).

Almost surely, 2^646993934 is an apocalyptic number.

646993934 is a deficient number, since it is larger than the sum of its proper divisors (329583538).

646993934 is a wasteful number, since it uses less digits than its factorization.

646993934 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2971.

The product of its digits is 3779136, while the sum is 53.

The square root of 646993934 is about 25436.0754441404. The cubic root of 646993934 is about 864.9016712491.

The spelling of 646993934 in words is "six hundred forty-six million, nine hundred ninety-three thousand, nine hundred thirty-four".