40028143 has 2 divisors, whose sum is σ = 40028144. Its totient is φ = 40028142.

The previous prime is 40028123. The next prime is 40028171. The reversal of 40028143 is 34182004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40028143 - 2⁵ = 40028111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40028113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20014071 + 20014072.

It is an arithmetic number, because the mean of its divisors is an integer number (20014072).

Almost surely, 2^40028143 is an apocalyptic number.

40028143 is a deficient number, since it is larger than the sum of its proper divisors (1).

40028143 is an equidigital number, since it uses as much as digits as its factorization.

40028143 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 40028143 is about 6326.7798286332. The cubic root of 40028143 is about 342.0753769541.

The spelling of 40028143 in words is "forty million, twenty-eight thousand, one hundred forty-three".