40440031 has 4 divisors (see below), whose sum is σ = 40506192. Its totient is φ = 40373872.

The previous prime is 40440019. The next prime is 40440077. The reversal of 40440031 is 13004404.

40440031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 40440031 - 2⁹ = 40439519 is a prime.

It is a super-2 number, since 2×40440031² = 3270792214561922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40439987 and 40440014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40440091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32155 + ... + 33388.

It is an arithmetic number, because the mean of its divisors is an integer number (10126548).

Almost surely, 2^40440031 is an apocalyptic number.

40440031 is a deficient number, since it is larger than the sum of its proper divisors (66161).

40440031 is an equidigital number, since it uses as much as digits as its factorization.

40440031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66160.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 40440031 is about 6359.2476756296. The cubic root of 40440031 is about 343.2446893617.

Adding to 40440031 its reverse (13004404), we get a palindrome (53444435).

The spelling of 40440031 in words is "forty million, four hundred forty thousand, thirty-one".