2190442 has 4 divisors (see below), whose sum is σ = 3285666. Its totient is φ = 1095220.

The previous prime is 2190439. The next prime is 2190469. The reversal of 2190442 is 2440912.

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., 1929321 + 261121 = 1389^2 + 511^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547609 + ... + 547612.

2^2190442 is an apocalyptic number.

2190442 is a deficient number, since it is larger than the sum of its proper divisors (1095224).

2190442 is a wasteful number, since it uses less digits than its factorization.

2190442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095223.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 2190442 is about 1480.0141891212. The cubic root of 2190442 is about 129.8705219722.

The spelling of 2190442 in words is "two million, one hundred ninety thousand, four hundred forty-two".