843240861 has 14 divisors (see below), whose sum is σ = 1264284030. Its totient is φ = 562160088.

The previous prime is 843240847. The next prime is 843240869. The reversal of 843240861 is 168042348.

843240861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 761428836 + 81812025 = 27594^2 + 9045^2 .

It is not a de Polignac number, because 843240861 - 2⁵ = 843240829 is a prime.

It is a super-2 number, since 2×843240861² = 1422110299320042642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (843240869) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 577626 + ... + 579083.

Almost surely, 2^843240861 is an apocalyptic number.

843240861 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

843240861 is a deficient number, since it is larger than the sum of its proper divisors (421043169).

843240861 is an equidigital number, since it uses as much as digits as its factorization.

843240861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156727 (or 1156712 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 843240861 is about 29038.6098324283. The cubic root of 843240861 is about 944.7506825282.

The spelling of 843240861 in words is "eight hundred forty-three million, two hundred forty thousand, eight hundred sixty-one".