943681 has 4 divisors (see below), whose sum is σ = 946864. Its totient is φ = 940500.

The previous prime is 943651. The next prime is 943693. The reversal of 943681 is 186349.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 186349 = 307 ⋅607.

It is a cyclic number.

It is not a de Polignac number, because 943681 - 2¹³ = 935489 is a prime.

It is a super-2 number, since 2×943681² = 1781067659522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (943601) 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, 1095 + ... + 1756.

It is an arithmetic number, because the mean of its divisors is an integer number (236716).

2⁹⁴³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

943681 is a deficient number, since it is larger than the sum of its proper divisors (3183).

943681 is a wasteful number, since it uses less digits than its factorization.

943681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3182.

The product of its digits is 5184, while the sum is 31.

The square root of 943681 is about 971.4324474713. The cubic root of 943681 is about 98.0863115767.

It can be divided in two parts, 9 and 43681, that multiplied together give a square (393129 = 627²).

The spelling of 943681 in words is "nine hundred forty-three thousand, six hundred eighty-one".