404506643 has 2 divisors, whose sum is σ = 404506644. Its totient is φ = 404506642.

The previous prime is 404506591. The next prime is 404506657. The reversal of 404506643 is 346605404.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 404506643 - 2²⁶ = 337397779 is a prime.

It is a super-2 number, since 2×404506643² = 327251248462258898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (404506673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202253321 + 202253322.

It is an arithmetic number, because the mean of its divisors is an integer number (202253322).

Almost surely, 2^404506643 is an apocalyptic number.

404506643 is a deficient number, since it is larger than the sum of its proper divisors (1).

404506643 is an equidigital number, since it uses as much as digits as its factorization.

404506643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 404506643 is about 20112.3505090777. The cubic root of 404506643 is about 739.5630747975.

The spelling of 404506643 in words is "four hundred four million, five hundred six thousand, six hundred forty-three".