405221801 has 4 divisors (see below), whose sum is σ = 418293504. Its totient is φ = 392150100.

The previous prime is 405221783. The next prime is 405221807. The reversal of 405221801 is 108122504.

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-405221801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405221807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6535805 + ... + 6535866.

It is an arithmetic number, because the mean of its divisors is an integer number (104573376).

Almost surely, 2^405221801 is an apocalyptic number.

It is an amenable number.

405221801 is a deficient number, since it is larger than the sum of its proper divisors (13071703).

405221801 is a wasteful number, since it uses less digits than its factorization.

405221801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13071702.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 405221801 is about 20130.1217333627. The cubic root of 405221801 is about 739.9986614293.

The spelling of 405221801 in words is "four hundred five million, two hundred twenty-one thousand, eight hundred one".