43520431 has 8 divisors (see below), whose sum is σ = 46241280. Its totient is φ = 40842648.

The previous prime is 43520423. The next prime is 43520441. The reversal of 43520431 is 13402534.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 43520431 - 2³ = 43520423 is a prime.

It is a super-2 number, since 2×43520431² = 3788055828851522, 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 (43520441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8671 + ... + 12736.

It is an arithmetic number, because the mean of its divisors is an integer number (5780160).

Almost surely, 2^43520431 is an apocalyptic number.

43520431 is a deficient number, since it is larger than the sum of its proper divisors (2720849).

43520431 is a wasteful number, since it uses less digits than its factorization.

43520431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21533.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 43520431 is about 6597.0016674244. The cubic root of 43520431 is about 351.7475349414.

Subtracting from 43520431 its sum of digits (22), we obtain a square (43520409 = 6597²).

Adding to 43520431 its reverse (13402534), we get a palindrome (56922965).

The spelling of 43520431 in words is "forty-three million, five hundred twenty thousand, four hundred thirty-one".