40020031 has 4 divisors (see below), whose sum is σ = 40049064. Its totient is φ = 39991000.

The previous prime is 40020017. The next prime is 40020037. The reversal of 40020031 is 13002004.

40020031 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 40020031 - 2¹⁵ = 39987263 is a prime.

It is a super-2 number, since 2×40020031² = 3203205762481922, 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 (40020037) 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, 12340 + ... + 15241.

It is an arithmetic number, because the mean of its divisors is an integer number (10012266).

Almost surely, 2^40020031 is an apocalyptic number.

40020031 is a deficient number, since it is larger than the sum of its proper divisors (29033).

40020031 is a wasteful number, since it uses less digits than its factorization.

40020031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29032.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 40020031 is about 6326.1387117261. The cubic root of 40020031 is about 342.0522673556.

Adding to 40020031 its reverse (13002004), we get a palindrome (53022035).

It can be divided in two parts, 4002003 and 1, that added together give a palindrome (4002004).

The spelling of 40020031 in words is "forty million, twenty thousand, thirty-one".