40043431 has 8 divisors (see below), whose sum is σ = 42300720. Its totient is φ = 37801152.

The previous prime is 40043417. The next prime is 40043467. The reversal of 40043431 is 13434004.

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 40043431 - 2¹⁷ = 39912359 is a prime.

It is a super-2 number, since 2×40043431² = 3206952732503522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40043399 and 40043408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40043401) 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, 1971 + ... + 9163.

It is an arithmetic number, because the mean of its divisors is an integer number (5287590).

Almost surely, 2^40043431 is an apocalyptic number.

40043431 is a deficient number, since it is larger than the sum of its proper divisors (2257289).

40043431 is a wasteful number, since it uses less digits than its factorization.

40043431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7505.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 40043431 is about 6327.9879108608. The cubic root of 40043431 is about 342.1189211734.

Adding to 40043431 its reverse (13434004), we get a palindrome (53477435).

The spelling of 40043431 in words is "forty million, forty-three thousand, four hundred thirty-one".