2189947 has 4 divisors (see below), whose sum is σ = 2240920. Its totient is φ = 2138976.

The previous prime is 2189939. The next prime is 2189981. The reversal of 2189947 is 7499812.

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

It is a cyclic number.

It is not a de Polignac number, because 2189947 - 2³ = 2189939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2189987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25422 + ... + 25507.

It is an arithmetic number, because the mean of its divisors is an integer number (560230).

2^2189947 is an apocalyptic number.

2189947 is a deficient number, since it is larger than the sum of its proper divisors (50973).

2189947 is an equidigital number, since it uses as much as digits as its factorization.

2189947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50972.

The product of its digits is 36288, while the sum is 40.

The square root of 2189947 is about 1479.8469515460. The cubic root of 2189947 is about 129.8607384443.

It can be divided in two parts, 2189 and 947, that added together give a square (3136 = 56²).

The spelling of 2189947 in words is "two million, one hundred eighty-nine thousand, nine hundred forty-seven".