40042042 has 4 divisors (see below), whose sum is σ = 60063066. Its totient is φ = 20021020.

The previous prime is 40042039. The next prime is 40042043. The reversal of 40042042 is 24024004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 31036041 + 9006001 = 5571^2 + 3001^2 .

It is a super-3 number, since 3×40042042³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (40042043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010509 + ... + 10010512.

Almost surely, 2^40042042 is an apocalyptic number.

40042042 is a deficient number, since it is larger than the sum of its proper divisors (20021024).

40042042 is a wasteful number, since it uses less digits than its factorization.

40042042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20021023.

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 40042042 is about 6327.8781593833. The cubic root of 40042042 is about 342.1149653962.

Adding to 40042042 its reverse (24024004), we get a palindrome (64066046).

The spelling of 40042042 in words is "forty million, forty-two thousand, forty-two", and thus it is an eban number.