408822391 has 4 divisors (see below), whose sum is σ = 409496512. Its totient is φ = 408148272.

The previous prime is 408822353. The next prime is 408822413. The reversal of 408822391 is 193228804.

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 408822391 - 2²³ = 400433783 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 408822391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (408822091) 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, 336150 + ... + 337363.

It is an arithmetic number, because the mean of its divisors is an integer number (102374128).

Almost surely, 2^408822391 is an apocalyptic number.

408822391 is a deficient number, since it is larger than the sum of its proper divisors (674121).

408822391 is an equidigital number, since it uses as much as digits as its factorization.

408822391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674120.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 408822391 is about 20219.3568394249. The cubic root of 408822391 is about 742.1839493512.

The spelling of 408822391 in words is "four hundred eight million, eight hundred twenty-two thousand, three hundred ninety-one".