43690 has 16 divisors (see below), whose sum is σ = 83592. Its totient is φ = 16384.

The previous prime is 43669. The next prime is 43691. The reversal of 43690 is 9634.

43690 is nontrivially palindromic in base 4 and base 16.

43690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

43690 is an esthetic number in base 2, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in 4 ways, for example, as 43681 + 9 = 209^2 + 3^2 .

It is a super-2 number, since 2×43690² = 3817632200, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

43690 is an undulating number in base 2.

43690 is a nontrivial repdigit in base 4 and base 16.

It is a plaindrome in base 4 and base 16.

It is a nialpdrome in base 4 and base 16.

It is a zygodrome in base 4 and base 16.

It is not an unprimeable number, because it can be changed into a prime (43691) by changing a digit.

In principle, a polygon with 43690 sides can be constructed with ruler and compass.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42 + ... + 298.

2⁴³⁶⁹⁰ is an apocalyptic number.

43690 is a deficient number, since it is larger than the sum of its proper divisors (39902).

43690 is a wasteful number, since it uses less digits than its factorization.

43690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 43690 is about 209.0215299915. The cubic root of 43690 is about 35.2203781796.

The spelling of 43690 in words is "forty-three thousand, six hundred ninety".