2189442645 has 96 divisors (see below), whose sum is σ = 4181329152. Its totient is φ = 1053305856.

The previous prime is 2189442643. The next prime is 2189442659. The reversal of 2189442645 is 5462449812.

It is a happy number.

2189442645 is a `hidden beast` number, since 2 + 189 + 4 + 426 + 45 = 666.

It is not a de Polignac number, because 2189442645 - 2¹ = 2189442643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2189442645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189442643) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7131582 + ... + 7131888.

It is an arithmetic number, because the mean of its divisors is an integer number (43555512).

Almost surely, 2^2189442645 is an apocalyptic number.

It is an amenable number.

2189442645 is a deficient number, since it is larger than the sum of its proper divisors (1991886507).

2189442645 is a wasteful number, since it uses less digits than its factorization.

2189442645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571 (or 568 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 2189442645 is about 46791.4804745479. The cubic root of 2189442645 is about 1298.5076850114.

The spelling of 2189442645 in words is "two billion, one hundred eighty-nine million, four hundred forty-two thousand, six hundred forty-five".