409223891 has 4 divisors (see below), whose sum is σ = 413442792. Its totient is φ = 405004992.

The previous prime is 409223879. The next prime is 409223897. The reversal of 409223891 is 198322904.

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 409223891 - 2¹⁰ = 409222867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (409223897) 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, 2109305 + ... + 2109498.

It is an arithmetic number, because the mean of its divisors is an integer number (103360698).

Almost surely, 2^409223891 is an apocalyptic number.

409223891 is a deficient number, since it is larger than the sum of its proper divisors (4218901).

409223891 is an equidigital number, since it uses as much as digits as its factorization.

409223891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4218900.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 409223891 is about 20229.2830075611. The cubic root of 409223891 is about 742.4268334377.

The spelling of 409223891 in words is "four hundred nine million, two hundred twenty-three thousand, eight hundred ninety-one".