2643843940 has 24 divisors (see below), whose sum is σ = 5592021120. Its totient is φ = 1049928288.

The previous prime is 2643843929. The next prime is 2643843971. The reversal of 2643843940 is 493483462.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 472732 + ... + 478291.

It is an arithmetic number, because the mean of its divisors is an integer number (233000880).

Almost surely, 2^2643843940 is an apocalyptic number.

2643843940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2643843940 is an abundant number, since it is smaller than the sum of its proper divisors (2948177180).

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

2643843940 is a wasteful number, since it uses less digits than its factorization.

2643843940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951171 (or 951169 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 43.

The square root of 2643843940 is about 51418.3229987132. The cubic root of 2643843940 is about 1382.7551098993.

It can be divided in two parts, 264384 and 3940, that added together give a square (268324 = 518²).

The spelling of 2643843940 in words is "two billion, six hundred forty-three million, eight hundred forty-three thousand, nine hundred forty".