2189437920 has 72 divisors (see below), whose sum is σ = 7471461816. Its totient is φ = 583849728.

The previous prime is 2189437909. The next prime is 2189437931. The reversal of 2189437920 is 297349812.

It is an interprime number because it is at equal distance from previous prime (2189437909) and next prime (2189437931).

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 758782 + ... + 761661.

It is an arithmetic number, because the mean of its divisors is an integer number (103770303).

Almost surely, 2^2189437920 is an apocalyptic number.

2189437920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2189437920 is an abundant number, since it is smaller than the sum of its proper divisors (5282023896).

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

2189437920 is a wasteful number, since it uses less digits than its factorization.

2189437920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520464 (or 1520453 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 2189437920 is about 46791.4299845602. The cubic root of 2189437920 is about 1298.5067509147.

The spelling of 2189437920 in words is "two billion, one hundred eighty-nine million, four hundred thirty-seven thousand, nine hundred twenty".