409019399 has 2 divisors, whose sum is σ = 409019400. Its totient is φ = 409019398.

The previous prime is 409019381. The next prime is 409019407. The reversal of 409019399 is 993910904.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 409019399 - 2²⁴ = 392242183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (409039399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204509699 + 204509700.

It is an arithmetic number, because the mean of its divisors is an integer number (204509700).

Almost surely, 2^409019399 is an apocalyptic number.

409019399 is a deficient number, since it is larger than the sum of its proper divisors (1).

409019399 is an equidigital number, since it uses as much as digits as its factorization.

409019399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 44.

The square root of 409019399 is about 20224.2280198775. The cubic root of 409019399 is about 742.3031475640.

The spelling of 409019399 in words is "four hundred nine million, nineteen thousand, three hundred ninety-nine".