2189938 has 4 divisors (see below), whose sum is σ = 3284910. Its totient is φ = 1094968.

The previous prime is 2189881. The next prime is 2189939. The reversal of 2189938 is 8399812.

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., 1385329 + 804609 = 1177^2 + 897^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2189938.

It is not an unprimeable number, because it can be changed into a prime (2189939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547483 + ... + 547486.

2^2189938 is an apocalyptic number.

2189938 is a deficient number, since it is larger than the sum of its proper divisors (1094972).

2189938 is a wasteful number, since it uses less digits than its factorization.

2189938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094971.

The product of its digits is 31104, while the sum is 40.

The square root of 2189938 is about 1479.8439106879. The cubic root of 2189938 is about 129.8605605483.

The spelling of 2189938 in words is "two million, one hundred eighty-nine thousand, nine hundred thirty-eight".