2188742 has 4 divisors (see below), whose sum is σ = 3283116. Its totient is φ = 1094370.

The previous prime is 2188729. The next prime is 2188751. The reversal of 2188742 is 2478812.

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

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2188699 and 2188708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 547184 + ... + 547187.

It is an arithmetic number, because the mean of its divisors is an integer number (820779).

2^2188742 is an apocalyptic number.

2188742 is a deficient number, since it is larger than the sum of its proper divisors (1094374).

2188742 is a wasteful number, since it uses less digits than its factorization.

2188742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1094373.

The product of its digits is 7168, while the sum is 32.

The square root of 2188742 is about 1479.4397588276. The cubic root of 2188742 is about 129.8369158130.

The spelling of 2188742 in words is "two million, one hundred eighty-eight thousand, seven hundred forty-two".