40044042 has 12 divisors (see below), whose sum is σ = 86762130. Its totient is φ = 13348008.

The previous prime is 40044023. The next prime is 40044083. The reversal of 40044042 is 24044004.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 38081241 + 1962801 = 6171^2 + 1401^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 2224669 = 40044042 / (4 + 0 + 0 + 4 + 4 + 0 + 4 + 2).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1112317 + ... + 1112352.

Almost surely, 2^40044042 is an apocalyptic number.

40044042 is an abundant number, since it is smaller than the sum of its proper divisors (46718088).

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

40044042 is a wasteful number, since it uses less digits than its factorization.

40044042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224677 (or 2224674 counting only the distinct ones).

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

The square root of 40044042 is about 6328.0361882657. The cubic root of 40044042 is about 342.1206612307.

Adding to 40044042 its reverse (24044004), we get a palindrome (64088046).

The spelling of 40044042 in words is "forty million, forty-four thousand, forty-two", and thus it is an eban number.