40142443 has 4 divisors (see below), whose sum is σ = 43791768. Its totient is φ = 36493120.

The previous prime is 40142419. The next prime is 40142449. The reversal of 40142443 is 34424104.

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 40142443 - 2²⁵ = 6588011 is a prime.

It is a super-2 number, since 2×40142443² = 3222831460016498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40142449) 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, 1824646 + ... + 1824667.

It is an arithmetic number, because the mean of its divisors is an integer number (10947942).

Almost surely, 2^40142443 is an apocalyptic number.

40142443 is a deficient number, since it is larger than the sum of its proper divisors (3649325).

40142443 is a wasteful number, since it uses less digits than its factorization.

40142443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3649324.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 40142443 is about 6335.8064206540. The cubic root of 40142443 is about 342.4006652451.

Adding to 40142443 its reverse (34424104), we get a palindrome (74566547).

The spelling of 40142443 in words is "forty million, one hundred forty-two thousand, four hundred forty-three".