40142243 has 4 divisors (see below), whose sum is σ = 40822680. Its totient is φ = 39461808.

The previous prime is 40142213. The next prime is 40142251. The reversal of 40142243 is 34224104.

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 40142243 - 2⁸ = 40141987 is a prime.

It is a super-2 number, since 2×40142243² = 3222799346142098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40142213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340130 + ... + 340247.

It is an arithmetic number, because the mean of its divisors is an integer number (10205670).

Almost surely, 2^40142243 is an apocalyptic number.

40142243 is a deficient number, since it is larger than the sum of its proper divisors (680437).

40142243 is an equidigital number, since it uses as much as digits as its factorization.

40142243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680436.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 40142243 is about 6335.7906373238. The cubic root of 40142243 is about 342.4000966014.

Adding to 40142243 its reverse (34224104), we get a palindrome (74366347).

The spelling of 40142243 in words is "forty million, one hundred forty-two thousand, two hundred forty-three".