40042239 has 4 divisors (see below), whose sum is σ = 53389656. Its totient is φ = 26694824.

The previous prime is 40042231. The next prime is 40042273. The reversal of 40042239 is 93224004.

It is a happy number.

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 40042239 - 2³ = 40042231 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6673704 + ... + 6673709.

It is an arithmetic number, because the mean of its divisors is an integer number (13347414).

Almost surely, 2^40042239 is an apocalyptic number.

40042239 is a deficient number, since it is larger than the sum of its proper divisors (13347417).

40042239 is a wasteful number, since it uses less digits than its factorization.

40042239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13347416.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 40042239 is about 6327.8937254034. The cubic root of 40042239 is about 342.1155264443.

The spelling of 40042239 in words is "forty million, forty-two thousand, two hundred thirty-nine".