2189407920 has 80 divisors (see below), whose sum is σ = 7756765440. Its totient is φ = 500435712.

The previous prime is 2189407907. The next prime is 2189408027. The reversal of 2189407920 is 297049812.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 649930 + ... + 653289.

It is an arithmetic number, because the mean of its divisors is an integer number (96959568).

Almost surely, 2^2189407920 is an apocalyptic number.

2189407920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2189407920 is an abundant number, since it is smaller than the sum of its proper divisors (5567357520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2189407920 is a wasteful number, since it uses less digits than its factorization.

2189407920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303242 (or 1303236 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 2189407920 is about 46791.1094119385. The cubic root of 2189407920 is about 1298.5008201109.

The spelling of 2189407920 in words is "two billion, one hundred eighty-nine million, four hundred seven thousand, nine hundred twenty".