646294239 has 12 divisors (see below), whose sum is σ = 934104600. Its totient is φ = 430600464.

The previous prime is 646294223. The next prime is 646294241. The reversal of 646294239 is 932492646.

It is not a de Polignac number, because 646294239 - 2⁴ = 646294223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646294194 and 646294203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646294249) 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 11 ways as a sum of consecutive naturals, for example, 5629 + ... + 36390.

It is an arithmetic number, because the mean of its divisors is an integer number (77842050).

Almost surely, 2^646294239 is an apocalyptic number.

646294239 is a deficient number, since it is larger than the sum of its proper divisors (287810361).

646294239 is a wasteful number, since it uses less digits than its factorization.

646294239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43734 (or 43731 counting only the distinct ones).

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

The square root of 646294239 is about 25422.3177346205. The cubic root of 646294239 is about 864.5897746310.

The spelling of 646294239 in words is "six hundred forty-six million, two hundred ninety-four thousand, two hundred thirty-nine".