40000031 has 8 divisors (see below), whose sum is σ = 42515280. Its totient is φ = 37502848.

The previous prime is 40000021. The next prime is 40000033. The reversal of 40000031 is 13000004.

40000031 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 40000031 - 2²² = 35805727 is a prime.

It is a super-2 number, since 2×40000031² = 3200004960001922, 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 = 39999973 and 40000018.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40000033) 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 7 ways as a sum of consecutive naturals, for example, 200 + ... + 8946.

It is an arithmetic number, because the mean of its divisors is an integer number (5314410).

Almost surely, 2^40000031 is an apocalyptic number.

40000031 is a deficient number, since it is larger than the sum of its proper divisors (2515249).

40000031 is a wasteful number, since it uses less digits than its factorization.

40000031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9033.

The product of its (nonzero) digits is 12, while the sum is 8.

The square root of 40000031 is about 6324.5577711015. The cubic root of 40000031 is about 341.9952776841.

Adding to 40000031 its reverse (13000004), we get a palindrome (53000035).

It can be divided in two parts, 4000003 and 1, that added together give a palindrome (4000004).

The spelling of 40000031 in words is "forty million, thirty-one", and thus it is an aban number and an uban number.