646439922 has 12 divisors (see below), whose sum is σ = 1400619870. Its totient is φ = 215479968.

The previous prime is 646439921. The next prime is 646439923. The reversal of 646439922 is 229934646.

It is an interprime number because it is at equal distance from previous prime (646439921) and next prime (646439923).

It can be written as a sum of positive squares in only one way, i.e., 643687641 + 2752281 = 25371^2 + 1659^2 .

It is not an unprimeable number, because it can be changed into a prime (646439921) 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 in 5 ways as a sum of consecutive naturals, for example, 17956647 + ... + 17956682.

Almost surely, 2^646439922 is an apocalyptic number.

646439922 is an abundant number, since it is smaller than the sum of its proper divisors (754179948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646439922 is a wasteful number, since it uses less digits than its factorization.

646439922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35913337 (or 35913334 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 646439922 is about 25425.1828312010. The cubic root of 646439922 is about 864.6547329537.

The spelling of 646439922 in words is "six hundred forty-six million, four hundred thirty-nine thousand, nine hundred twenty-two".