43140431 has 4 divisors (see below), whose sum is σ = 45411000. Its totient is φ = 40869864.

The previous prime is 43140421. The next prime is 43140443. The reversal of 43140431 is 13404134.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13404134 = 2 ⋅6702067.

It is a cyclic number.

It is not a de Polignac number, because 43140431 - 2¹⁰ = 43139407 is a prime.

It is a super-2 number, since 2×43140431² = 3722193573731522, 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 (43140401) 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, 1135256 + ... + 1135293.

It is an arithmetic number, because the mean of its divisors is an integer number (11352750).

Almost surely, 2^43140431 is an apocalyptic number.

43140431 is a deficient number, since it is larger than the sum of its proper divisors (2270569).

43140431 is a wasteful number, since it uses less digits than its factorization.

43140431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270568.

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

The square root of 43140431 is about 6568.1375594608. The cubic root of 43140431 is about 350.7207758688.

Adding to 43140431 its reverse (13404134), we get a palindrome (56544565).

The spelling of 43140431 in words is "forty-three million, one hundred forty thousand, four hundred thirty-one".