646321423 has 8 divisors (see below), whose sum is σ = 742187520. Its totient is φ = 556640280.

The previous prime is 646321399. The next prime is 646321441. The reversal of 646321423 is 324123646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 646321423 - 2²¹ = 644224271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646321483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1546015 + ... + 1546432.

It is an arithmetic number, because the mean of its divisors is an integer number (92773440).

Almost surely, 2^646321423 is an apocalyptic number.

646321423 is a deficient number, since it is larger than the sum of its proper divisors (95866097).

646321423 is a wasteful number, since it uses less digits than its factorization.

646321423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3092477.

The product of its digits is 20736, while the sum is 31.

The square root of 646321423 is about 25422.8523773396. The cubic root of 646321423 is about 864.6018963951.

The spelling of 646321423 in words is "six hundred forty-six million, three hundred twenty-one thousand, four hundred twenty-three".