431423999 has 4 divisors (see below), whose sum is σ = 434070936. Its totient is φ = 428777064.

The previous prime is 431423963. The next prime is 431424001. The reversal of 431423999 is 999324134.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999324134 = 2 ⋅499662067.

It is a cyclic number.

It is not a de Polignac number, because 431423999 - 2⁸ = 431423743 is a prime.

It is a super-2 number, since 2×431423999² = 372253333826304002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431323999) 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, 1323224 + ... + 1323549.

It is an arithmetic number, because the mean of its divisors is an integer number (108517734).

Almost surely, 2^431423999 is an apocalyptic number.

431423999 is a deficient number, since it is larger than the sum of its proper divisors (2646937).

431423999 is a wasteful number, since it uses less digits than its factorization.

431423999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646936.

The product of its digits is 209952, while the sum is 44.

The square root of 431423999 is about 20770.7486384097. The cubic root of 431423999 is about 755.6165009718.

The spelling of 431423999 in words is "four hundred thirty-one million, four hundred twenty-three thousand, nine hundred ninety-nine".