404549399 has 2 divisors, whose sum is σ = 404549400. Its totient is φ = 404549398.

The previous prime is 404549393. The next prime is 404549401. The reversal of 404549399 is 993945404.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404549399 is a prime.

It is a super-2 number, since 2×404549399² = 327320432462522402, which contains 22 as substring.

Together with 404549401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (404549393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202274699 + 202274700.

It is an arithmetic number, because the mean of its divisors is an integer number (202274700).

Almost surely, 2^404549399 is an apocalyptic number.

404549399 is a deficient number, since it is larger than the sum of its proper divisors (1).

404549399 is an equidigital number, since it uses as much as digits as its factorization.

404549399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 404549399 is about 20113.4134099610. The cubic root of 404549399 is about 739.5891309372.

The spelling of 404549399 in words is "four hundred four million, five hundred forty-nine thousand, three hundred ninety-nine".