40042043 has 2 divisors, whose sum is σ = 40042044. Its totient is φ = 40042042.

The previous prime is 40042039. The next prime is 40042099. The reversal of 40042043 is 34024004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40042043 - 2² = 40042039 is a prime.

It is a super-2 number, since 2×40042043² = 3206730415227698, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40042643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20021021 + 20021022.

It is an arithmetic number, because the mean of its divisors is an integer number (20021022).

Almost surely, 2^40042043 is an apocalyptic number.

40042043 is a deficient number, since it is larger than the sum of its proper divisors (1).

40042043 is an equidigital number, since it uses as much as digits as its factorization.

40042043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 40042043 is about 6327.8782383987. The cubic root of 40042043 is about 342.1149682441.

Adding to 40042043 its reverse (34024004), we get a palindrome (74066047).

The spelling of 40042043 in words is "forty million, forty-two thousand, forty-three".