405123399 has 6 divisors (see below), whose sum is σ = 585178256. Its totient is φ = 270082260.

The previous prime is 405123371. The next prime is 405123427. The reversal of 405123399 is 993321504.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (405123371) and next prime (405123427).

It is not a de Polignac number, because 405123399 - 2²³ = 396734791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405123319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22506847 + ... + 22506864.

Almost surely, 2^405123399 is an apocalyptic number.

405123399 is a deficient number, since it is larger than the sum of its proper divisors (180054857).

405123399 is a wasteful number, since it uses less digits than its factorization.

405123399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45013717 (or 45013714 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 36.

The square root of 405123399 is about 20127.6774368033. The cubic root of 405123399 is about 739.9387574104.

The spelling of 405123399 in words is "four hundred five million, one hundred twenty-three thousand, three hundred ninety-nine".