2188449987 has 8 divisors (see below), whose sum is σ = 2918158080. Its totient is φ = 1458854280.

The previous prime is 2188449983. The next prime is 2188450003. The reversal of 2188449987 is 7899448812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2188449987 - 2² = 2188449983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2188449987.

It is not an unprimeable number, because it can be changed into a prime (2188449983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43162 + ... + 78992.

It is an arithmetic number, because the mean of its divisors is an integer number (364769760).

Almost surely, 2^2188449987 is an apocalyptic number.

2188449987 is a deficient number, since it is larger than the sum of its proper divisors (729708093).

2188449987 is a wasteful number, since it uses less digits than its factorization.

2188449987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56193.

The product of its digits is 9289728, while the sum is 60.

The square root of 2188449987 is about 46780.8720205171. The cubic root of 2188449987 is about 1298.3114145292.

The spelling of 2188449987 in words is "two billion, one hundred eighty-eight million, four hundred forty-nine thousand, nine hundred eighty-seven".