646842973 has 12 divisors (see below), whose sum is σ = 792053760. Its totient is φ = 525255192.

The previous prime is 646842971. The next prime is 646842997. The reversal of 646842973 is 379248646.

It is not a de Polignac number, because 646842973 - 2¹ = 646842971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646842971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 346461 + ... + 348322.

It is an arithmetic number, because the mean of its divisors is an integer number (66004480).

Almost surely, 2^646842973 is an apocalyptic number.

It is an amenable number.

646842973 is a deficient number, since it is larger than the sum of its proper divisors (145210787).

646842973 is a wasteful number, since it uses less digits than its factorization.

646842973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 694816 (or 694809 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 49.

The square root of 646842973 is about 25433.1078124558. The cubic root of 646842973 is about 864.8343977810.

The spelling of 646842973 in words is "six hundred forty-six million, eight hundred forty-two thousand, nine hundred seventy-three".