408227891 has 4 divisors (see below), whose sum is σ = 408327192. Its totient is φ = 408128592.

The previous prime is 408227873. The next prime is 408227923. The reversal of 408227891 is 198722804.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 408227891 - 2¹⁰ = 408226867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408227801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43205 + ... + 51798.

It is an arithmetic number, because the mean of its divisors is an integer number (102081798).

Almost surely, 2^408227891 is an apocalyptic number.

408227891 is a deficient number, since it is larger than the sum of its proper divisors (99301).

408227891 is an equidigital number, since it uses as much as digits as its factorization.

408227891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99300.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 408227891 is about 20204.6502320629. The cubic root of 408227891 is about 741.8240192893.

The spelling of 408227891 in words is "four hundred eight million, two hundred twenty-seven thousand, eight hundred ninety-one".