40431143 has 4 divisors (see below), whose sum is σ = 40444488. Its totient is φ = 40417800.

The previous prime is 40431119. The next prime is 40431199. The reversal of 40431143 is 34113404.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40431143 - 2²² = 36236839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40431113) 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, 305 + ... + 8997.

It is an arithmetic number, because the mean of its divisors is an integer number (10111122).

Almost surely, 2^40431143 is an apocalyptic number.

40431143 is a deficient number, since it is larger than the sum of its proper divisors (13345).

40431143 is an equidigital number, since it uses as much as digits as its factorization.

40431143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13344.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 40431143 is about 6358.5488124257. The cubic root of 40431143 is about 343.2195411587.

Adding to 40431143 its reverse (34113404), we get a palindrome (74544547).

The spelling of 40431143 in words is "forty million, four hundred thirty-one thousand, one hundred forty-three".