40440042 has 24 divisors (see below), whose sum is σ = 92774916. Its totient is φ = 12686976.

The previous prime is 40440019. The next prime is 40440077. The reversal of 40440042 is 24004404.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 39050001 + 1390041 = 6249^2 + 1179^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 40439997 and 40440024.

It is an unprimeable 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 11 ways as a sum of consecutive naturals, for example, 65773 + ... + 66384.

Almost surely, 2^40440042 is an apocalyptic number.

40440042 is an abundant number, since it is smaller than the sum of its proper divisors (52334874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40440042 is a wasteful number, since it uses less digits than its factorization.

40440042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132182 (or 132179 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 40440042 is about 6359.2485405117. The cubic root of 40440042 is about 343.2447204835.

Adding to 40440042 its reverse (24004404), we get a palindrome (64444446).

The spelling of 40440042 in words is "forty million, four hundred forty thousand, forty-two".