43686961 has 4 divisors (see below), whose sum is σ = 43773300. Its totient is φ = 43600624.

The previous prime is 43686943. The next prime is 43686983. The reversal of 43686961 is 16968634.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15649936 + 28037025 = 3956^2 + 5295^2 .

It is a cyclic number.

It is not a de Polignac number, because 43686961 - 2¹¹ = 43684913 is a prime.

It is a super-2 number, since 2×43686961² = 3817101122831042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43686931) 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, 42406 + ... + 43423.

It is an arithmetic number, because the mean of its divisors is an integer number (10943325).

Almost surely, 2^43686961 is an apocalyptic number.

It is an amenable number.

43686961 is a deficient number, since it is larger than the sum of its proper divisors (86339).

43686961 is an equidigital number, since it uses as much as digits as its factorization.

43686961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86338.

The product of its digits is 186624, while the sum is 43.

The square root of 43686961 is about 6609.6112593707. The cubic root of 43686961 is about 352.1956153804.

The spelling of 43686961 in words is "forty-three million, six hundred eighty-six thousand, nine hundred sixty-one".