405643801 has 4 divisors (see below), whose sum is σ = 423280512. Its totient is φ = 388007092.

The previous prime is 405643781. The next prime is 405643807. The reversal of 405643801 is 108346504.

It is a happy number.

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 not a de Polignac number, because 405643801 - 2⁹ = 405643289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405643807) 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, 8818321 + ... + 8818366.

It is an arithmetic number, because the mean of its divisors is an integer number (105820128).

Almost surely, 2^405643801 is an apocalyptic number.

It is an amenable number.

405643801 is a deficient number, since it is larger than the sum of its proper divisors (17636711).

405643801 is a wasteful number, since it uses less digits than its factorization.

405643801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17636710.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 405643801 is about 20140.6008103035. The cubic root of 405643801 is about 740.2554517384.

The spelling of 405643801 in words is "four hundred five million, six hundred forty-three thousand, eight hundred one".