2090042 has 4 divisors (see below), whose sum is σ = 3135066. Its totient is φ = 1045020.

The previous prime is 2090041. The next prime is 2090047. The reversal of 2090042 is 2400902.

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., 2070721 + 19321 = 1439^2 + 139^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2090042.

It is not an unprimeable number, because it can be changed into a prime (2090041) 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 as a sum of consecutive naturals, namely, 522509 + ... + 522512.

2^2090042 is an apocalyptic number.

2090042 is a deficient number, since it is larger than the sum of its proper divisors (1045024).

2090042 is a wasteful number, since it uses less digits than its factorization.

2090042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1045023.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2090042 is about 1445.6977554109. The cubic root of 2090042 is about 127.8551828978.

Adding to 2090042 its reverse (2400902), we get a palindrome (4490944).

The spelling of 2090042 in words is "two million, ninety thousand, forty-two".