646392473 has 2 divisors, whose sum is σ = 646392474. Its totient is φ = 646392472.

The previous prime is 646392433. The next prime is 646392497. The reversal of 646392473 is 374293646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 375855769 + 270536704 = 19387^2 + 16448^2 .

It is a cyclic number.

It is not a de Polignac number, because 646392473 - 2¹⁴ = 646376089 is a prime.

It is a super-3 number, since 3×646392473³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (646392403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323196236 + 323196237.

It is an arithmetic number, because the mean of its divisors is an integer number (323196237).

Almost surely, 2^646392473 is an apocalyptic number.

It is an amenable number.

646392473 is a deficient number, since it is larger than the sum of its proper divisors (1).

646392473 is an equidigital number, since it uses as much as digits as its factorization.

646392473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 44.

The square root of 646392473 is about 25424.2497037769. The cubic root of 646392473 is about 864.6335770789.

The spelling of 646392473 in words is "six hundred forty-six million, three hundred ninety-two thousand, four hundred seventy-three".