40143031 has 4 divisors (see below), whose sum is σ = 40163200. Its totient is φ = 40122864.

The previous prime is 40143017. The next prime is 40143041. The reversal of 40143031 is 13034104.

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 40143031 - 2⁹ = 40142519 is a prime.

It is a super-2 number, since 2×40143031² = 3222925875733922, 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 = 40142996 and 40143014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40143011) 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, 6726 + ... + 11203.

It is an arithmetic number, because the mean of its divisors is an integer number (10040800).

Almost surely, 2^40143031 is an apocalyptic number.

40143031 is a deficient number, since it is larger than the sum of its proper divisors (20169).

40143031 is a wasteful number, since it uses less digits than its factorization.

40143031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20168.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 40143031 is about 6335.8528234169. The cubic root of 40143031 is about 342.4023370468.

Adding to 40143031 its reverse (13034104), we get a palindrome (53177135).

The spelling of 40143031 in words is "forty million, one hundred forty-three thousand, thirty-one".