409399499 has 2 divisors, whose sum is σ = 409399500. Its totient is φ = 409399498.

The previous prime is 409399481. The next prime is 409399511. The reversal of 409399499 is 994993904.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 409399499 - 2²⁰ = 408350923 is a prime.

It is not a weakly prime, because it can be changed into another prime (409399399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204699749 + 204699750.

It is an arithmetic number, because the mean of its divisors is an integer number (204699750).

Almost surely, 2^409399499 is an apocalyptic number.

409399499 is a deficient number, since it is larger than the sum of its proper divisors (1).

409399499 is an equidigital number, since it uses as much as digits as its factorization.

409399499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2834352, while the sum is 56.

The square root of 409399499 is about 20233.6229825506. The cubic root of 409399499 is about 742.5330161000.

The spelling of 409399499 in words is "four hundred nine million, three hundred ninety-nine thousand, four hundred ninety-nine".