40042790 has 8 divisors (see below), whose sum is σ = 72077040. Its totient is φ = 16017112.

The previous prime is 40042789. The next prime is 40042799. The reversal of 40042790 is 9724004.

40042790 is nontrivially palindromic in base 9.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40042799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2002130 + ... + 2002149.

It is an arithmetic number, because the mean of its divisors is an integer number (9009630).

Almost surely, 2^40042790 is an apocalyptic number.

40042790 is a deficient number, since it is larger than the sum of its proper divisors (32034250).

40042790 is a wasteful number, since it uses less digits than its factorization.

40042790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4004286.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 40042790 is about 6327.9372626473. The cubic root of 40042790 is about 342.1170956605.

Adding to 40042790 its reverse (9724004), we get a palindrome (49766794).

The spelling of 40042790 in words is "forty million, forty-two thousand, seven hundred ninety".