40442 has 8 divisors (see below), whose sum is σ = 61716. Its totient is φ = 19872.

The previous prime is 40433. The next prime is 40459. The reversal of 40442 is 24404.

It can be written as a sum of positive squares in 2 ways, for example, as 39601 + 841 = 199^2 + 29^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

40442 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 8 + ... + 284.

2⁴⁰⁴⁴² is an apocalyptic number.

40442 is a deficient number, since it is larger than the sum of its proper divisors (21274).

40442 is a wasteful number, since it uses less digits than its factorization.

40442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352.

The product of its (nonzero) digits is 128, while the sum is 14.

The square root of 40442 is about 201.1019641873. The cubic root of 40442 is about 34.3250260062.

Adding to 40442 its reverse (24404), we get a palindrome (64846).

The spelling of 40442 in words is "forty thousand, four hundred forty-two", and thus it is an iban number.