423906561 has 32 divisors (see below), whose sum is σ = 689109120. Its totient is φ = 255932352.

The previous prime is 423906541. The next prime is 423906589. The reversal of 423906561 is 165609324.

It is a happy number.

423906561 is a `hidden beast` number, since 4 + 2 + 3 + 90 + 6 + 561 = 666.

It is not a de Polignac number, because 423906561 - 2⁵ = 423906529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (423906541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7210 + ... + 29996.

It is an arithmetic number, because the mean of its divisors is an integer number (21534660).

Almost surely, 2^423906561 is an apocalyptic number.

It is an amenable number.

423906561 is a deficient number, since it is larger than the sum of its proper divisors (265202559).

423906561 is a wasteful number, since it uses less digits than its factorization.

423906561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22862 (or 22856 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 423906561 is about 20588.9912574657. The cubic root of 423906561 is about 751.2019606916.

The spelling of 423906561 in words is "four hundred twenty-three million, nine hundred six thousand, five hundred sixty-one".