646884393 has 16 divisors (see below), whose sum is σ = 916730880. Its totient is φ = 404588304.

The previous prime is 646884383. The next prime is 646884439. The reversal of 646884393 is 393488646.

It is a happy number.

It is not a de Polignac number, because 646884393 - 2⁴ = 646884377 is a prime.

It is a super-3 number, since 3×646884393³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (646884313) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49221 + ... + 60962.

It is an arithmetic number, because the mean of its divisors is an integer number (57295680).

Almost surely, 2^646884393 is an apocalyptic number.

It is an amenable number.

646884393 is a deficient number, since it is larger than the sum of its proper divisors (269846487).

646884393 is a wasteful number, since it uses less digits than its factorization.

646884393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110308.

The product of its digits is 2985984, while the sum is 51.

The square root of 646884393 is about 25433.9220923553. The cubic root of 646884393 is about 864.8528570144.

The spelling of 646884393 in words is "six hundred forty-six million, eight hundred eighty-four thousand, three hundred ninety-three".