409685399 has 4 divisors (see below), whose sum is σ = 409731960. Its totient is φ = 409638840.

The previous prime is 409685383. The next prime is 409685449. The reversal of 409685399 is 993586904.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 409685399 - 2⁴ = 409685383 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 409685399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (409685099) 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, 5612 + ... + 29169.

It is an arithmetic number, because the mean of its divisors is an integer number (102432990).

Almost surely, 2^409685399 is an apocalyptic number.

409685399 is a deficient number, since it is larger than the sum of its proper divisors (46561).

409685399 is a wasteful number, since it uses less digits than its factorization.

409685399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46560.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 409685399 is about 20240.6867225398. The cubic root of 409685399 is about 742.7058226879.

The spelling of 409685399 in words is "four hundred nine million, six hundred eighty-five thousand, three hundred ninety-nine".