2188489385 has 4 divisors (see below), whose sum is σ = 2626187268. Its totient is φ = 1750791504.

The previous prime is 2188489367. The next prime is 2188489393. The reversal of 2188489385 is 5839848812.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1325833744 + 862655641 = 36412^2 + 29371^2 .

It is a cyclic number.

It is not a de Polignac number, because 2188489385 - 2²⁸ = 1920053929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2188489385.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218848934 + ... + 218848943.

It is an arithmetic number, because the mean of its divisors is an integer number (656546817).

Almost surely, 2^2188489385 is an apocalyptic number.

It is an amenable number.

2188489385 is a deficient number, since it is larger than the sum of its proper divisors (437697883).

2188489385 is an equidigital number, since it uses as much as digits as its factorization.

2188489385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437697882.

The product of its digits is 4423680, while the sum is 56.

The square root of 2188489385 is about 46781.2931095326. The cubic root of 2188489385 is about 1298.3192055178.

The spelling of 2188489385 in words is "two billion, one hundred eighty-eight million, four hundred eighty-nine thousand, three hundred eighty-five".