2159405680 has 20 divisors (see below), whose sum is σ = 5020618392. Its totient is φ = 863762240.

The previous prime is 2159405653. The next prime is 2159405683. The reversal of 2159405680 is 865049512.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2159405683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13496206 + ... + 13496365.

Almost surely, 2^2159405680 is an apocalyptic number.

2159405680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2159405680 is an abundant number, since it is smaller than the sum of its proper divisors (2861212712).

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

2159405680 is a wasteful number, since it uses less digits than its factorization.

2159405680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26992584 (or 26992578 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 40.

The square root of 2159405680 is about 46469.4058494403. The cubic root of 2159405680 is about 1292.5422454008.

The spelling of 2159405680 in words is "two billion, one hundred fifty-nine million, four hundred five thousand, six hundred eighty".