43320431 has 32 divisors (see below), whose sum is σ = 57424896. Its totient is φ = 31680000.

The previous prime is 43320421. The next prime is 43320449. The reversal of 43320431 is 13402334.

It is not a de Polignac number, because 43320431 - 2¹⁰ = 43319407 is a prime.

It is a super-2 number, since 2×43320431² = 3753319484051522, 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 (43320421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 107831 + ... + 108231.

It is an arithmetic number, because the mean of its divisors is an integer number (1794528).

Almost surely, 2^43320431 is an apocalyptic number.

43320431 is a deficient number, since it is larger than the sum of its proper divisors (14104465).

43320431 is a wasteful number, since it uses less digits than its factorization.

43320431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503.

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 43320431 is about 6581.8258105179. The cubic root of 43320431 is about 351.2078838237.

Adding to 43320431 its reverse (13402334), we get a palindrome (56722765).

The spelling of 43320431 in words is "forty-three million, three hundred twenty thousand, four hundred thirty-one".