2120343440 has 80 divisors (see below), whose sum is σ = 5047230528. Its totient is φ = 828092928.

The previous prime is 2120343427. The next prime is 2120343443. The reversal of 2120343440 is 443430212.

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

It is not an unprimeable number, because it can be changed into a prime (2120343443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 961379 + ... + 963581.

Almost surely, 2^2120343440 is an apocalyptic number.

2120343440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2120343440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2523615264).

2120343440 is an abundant number, since it is smaller than the sum of its proper divisors (2926887088).

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

2120343440 is a wasteful number, since it uses less digits than its factorization.

2120343440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2496 (or 2490 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 2120343440 is about 46047.1871019284. The cubic root of 2120343440 is about 1284.7010240763.

Adding to 2120343440 its reverse (443430212), we get a palindrome (2563773652).

The spelling of 2120343440 in words is "two billion, one hundred twenty million, three hundred forty-three thousand, four hundred forty".