431323905 has 16 divisors (see below), whose sum is σ = 693935424. Its totient is φ = 228767040.

The previous prime is 431323903. The next prime is 431323939. The reversal of 431323905 is 509323134.

It is not a de Polignac number, because 431323905 - 2¹ = 431323903 is a prime.

It is a super-2 number, since 2×431323905² = 372080622048898050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (431323901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76719 + ... + 82148.

It is an arithmetic number, because the mean of its divisors is an integer number (43370964).

Almost surely, 2^431323905 is an apocalyptic number.

It is an amenable number.

431323905 is a deficient number, since it is larger than the sum of its proper divisors (262611519).

431323905 is a wasteful number, since it uses less digits than its factorization.

431323905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159056.

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 431323905 is about 20768.3390043595. The cubic root of 431323905 is about 755.5580599887.

The spelling of 431323905 in words is "four hundred thirty-one million, three hundred twenty-three thousand, nine hundred five".