40012143 has 4 divisors (see below), whose sum is σ = 53349528. Its totient is φ = 26674760.

The previous prime is 40012139. The next prime is 40012153. The reversal of 40012143 is 34121004.

40012143 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 40012143 - 2² = 40012139 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40012153) 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, 6668688 + ... + 6668693.

It is an arithmetic number, because the mean of its divisors is an integer number (13337382).

Almost surely, 2^40012143 is an apocalyptic number.

40012143 is a deficient number, since it is larger than the sum of its proper divisors (13337385).

40012143 is a wasteful number, since it uses less digits than its factorization.

40012143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13337384.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 40012143 is about 6325.5152359314. The cubic root of 40012143 is about 342.0297928972.

Adding to 40012143 its reverse (34121004), we get a palindrome (74133147).

The spelling of 40012143 in words is "forty million, twelve thousand, one hundred forty-three".