431430321 has 16 divisors (see below), whose sum is σ = 692019200. Its totient is φ = 233556048.

The previous prime is 431430289. The next prime is 431430367. The reversal of 431430321 is 123034134.

It is not a de Polignac number, because 431430321 - 2⁵ = 431430289 is a prime.

It is a super-2 number, since 2×431430321² = 372264243756326082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431430371) 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, 540241 + ... + 541038.

It is an arithmetic number, because the mean of its divisors is an integer number (43251200).

Almost surely, 2^431430321 is an apocalyptic number.

It is an amenable number.

431430321 is a deficient number, since it is larger than the sum of its proper divisors (260588879).

431430321 is a wasteful number, since it uses less digits than its factorization.

431430321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081308.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 431430321 is about 20770.9008230264. The cubic root of 431430321 is about 755.6201918375.

Adding to 431430321 its reverse (123034134), we get a palindrome (554464455).

The spelling of 431430321 in words is "four hundred thirty-one million, four hundred thirty thousand, three hundred twenty-one".