2123343440 has 160 divisors (see below), whose sum is σ = 5392797696. Its totient is φ = 775272960.

The previous prime is 2123343437. The next prime is 2123343473. The reversal of 2123343440 is 443433212.

2123343440 = 3035² + 3036² + ... + 3249².

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 3718355 + ... + 3718925.

Almost surely, 2^2123343440 is an apocalyptic number.

2123343440 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 2123343440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2696398848).

2123343440 is an abundant number, since it is smaller than the sum of its proper divisors (3269454256).

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

2123343440 is a wasteful number, since it uses less digits than its factorization.

2123343440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 697 (or 691 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

The square root of 2123343440 is about 46079.7508673821. The cubic root of 2123343440 is about 1285.3066314429.

Adding to 2123343440 its reverse (443433212), we get a palindrome (2566776652).

The spelling of 2123343440 in words is "two billion, one hundred twenty-three million, three hundred forty-three thousand, four hundred forty".