405664601 has 4 divisors (see below), whose sum is σ = 405736704. Its totient is φ = 405592500.

The previous prime is 405664541. The next prime is 405664603. The reversal of 405664601 is 106466504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405664601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405664603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26825 + ... + 39126.

It is an arithmetic number, because the mean of its divisors is an integer number (101434176).

Almost surely, 2^405664601 is an apocalyptic number.

It is an amenable number.

405664601 is a deficient number, since it is larger than the sum of its proper divisors (72103).

405664601 is an equidigital number, since it uses as much as digits as its factorization.

405664601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72102.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 405664601 is about 20141.1171735830. The cubic root of 405664601 is about 740.2681040952.

The spelling of 405664601 in words is "four hundred five million, six hundred sixty-four thousand, six hundred one".