843406861 has 16 divisors (see below), whose sum is σ = 941518080. Its totient is φ = 748995520.

The previous prime is 843406847. The next prime is 843406871. The reversal of 843406861 is 168604348.

It is a cyclic number.

It is not a de Polignac number, because 843406861 - 2²⁵ = 809852429 is a prime.

It is a super-2 number, since 2×843406861² = 1422670266363746642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (843406831) 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, 136311 + ... + 142363.

It is an arithmetic number, because the mean of its divisors is an integer number (58844880).

Almost surely, 2^843406861 is an apocalyptic number.

It is an amenable number.

843406861 is a deficient number, since it is larger than the sum of its proper divisors (98111219).

843406861 is a wasteful number, since it uses less digits than its factorization.

843406861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6356.

The product of its (nonzero) digits is 110592, while the sum is 40.

The square root of 843406861 is about 29041.4679553221. The cubic root of 843406861 is about 944.8126728525.

It can be divided in two parts, 843 and 406861, that added together give a palindrome (407704).

The spelling of 843406861 in words is "eight hundred forty-three million, four hundred six thousand, eight hundred sixty-one".