42040049 has 4 divisors (see below), whose sum is σ = 42223860. Its totient is φ = 41856240.

The previous prime is 42040007. The next prime is 42040051. The reversal of 42040049 is 94004024.

It is a happy number.

42040049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 31281649 + 10758400 = 5593^2 + 3280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42040049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42040069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91562 + ... + 92019.

It is an arithmetic number, because the mean of its divisors is an integer number (10555965).

Almost surely, 2^42040049 is an apocalyptic number.

It is an amenable number.

42040049 is a deficient number, since it is larger than the sum of its proper divisors (183811).

42040049 is a wasteful number, since it uses less digits than its factorization.

42040049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183810.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 42040049 is about 6483.8298096110. The cubic root of 42040049 is about 347.7131146206.

The spelling of 42040049 in words is "forty-two million, forty thousand, forty-nine".