268721843 has 4 divisors (see below), whose sum is σ = 289392768. Its totient is φ = 248050920.

The previous prime is 268721809. The next prime is 268721863. The reversal of 268721843 is 348127862.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 268721843 - 2⁶ = 268721779 is a prime.

It is a super-2 number, since 2×268721843² = 144422857810633298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 268721843.

It is not an unprimeable number, because it can be changed into a prime (268721863) 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, 10335443 + ... + 10335468.

It is an arithmetic number, because the mean of its divisors is an integer number (72348192).

Almost surely, 2^268721843 is an apocalyptic number.

268721843 is a deficient number, since it is larger than the sum of its proper divisors (20670925).

268721843 is a wasteful number, since it uses less digits than its factorization.

268721843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20670924.

The product of its digits is 129024, while the sum is 41.

The square root of 268721843 is about 16392.7375078112. The cubic root of 268721843 is about 645.3089023749.

The spelling of 268721843 in words is "two hundred sixty-eight million, seven hundred twenty-one thousand, eight hundred forty-three".