40431 has 4 divisors (see below), whose sum is σ = 53912. Its totient is φ = 26952.

The previous prime is 40429. The next prime is 40433. The reversal of 40431 is 13404.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (40429) and next prime (40433).

It is not a de Polignac number, because 40431 - 2¹ = 40429 is a prime.

It is a super-2 number, since 2×40431² = 3269331522, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40433) 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, 6736 + ... + 6741.

It is an arithmetic number, because the mean of its divisors is an integer number (13478).

2⁴⁰⁴³¹ is an apocalyptic number.

40431 is a deficient number, since it is larger than the sum of its proper divisors (13481).

40431 is a wasteful number, since it uses less digits than its factorization.

40431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13480.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 40431 is about 201.0746130172. The cubic root of 40431 is about 34.3219136516.

Adding to 40431 its reverse (13404), we get a palindrome (53835).

It can be divided in two parts, 404 and 31, that added together give a triangular number (435 = T₂₉).

The spelling of 40431 in words is "forty thousand, four hundred thirty-one".