2140042 has 4 divisors (see below), whose sum is σ = 3210066. Its totient is φ = 1070020.

The previous prime is 2140013. The next prime is 2140049. The reversal of 2140042 is 2400412.

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., 1962801 + 177241 = 1401^2 + 421^2 .

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2140049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 535009 + ... + 535012.

2^2140042 is an apocalyptic number.

2140042 is a deficient number, since it is larger than the sum of its proper divisors (1070024).

2140042 is a wasteful number, since it uses less digits than its factorization.

2140042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070023.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2140042 is about 1462.8882390668. Note that the first 3 decimals coincide. The cubic root of 2140042 is about 128.8667172965.

Adding to 2140042 its reverse (2400412), we get a palindrome (4540454).

The spelling of 2140042 in words is "two million, one hundred forty thousand, forty-two".