43687 has 6 divisors (see below), whose sum is σ = 50568. Its totient is φ = 36972.

The previous prime is 43669. The next prime is 43691. The reversal of 43687 is 78634.

It is a de Polignac number, because none of the positive numbers 2^k-43687 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43607) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 514 + ... + 592.

It is an arithmetic number, because the mean of its divisors is an integer number (8428).

2⁴³⁶⁸⁷ is an apocalyptic number.

43687 is a deficient number, since it is larger than the sum of its proper divisors (6881).

43687 is an frugal number, since it uses more digits than its factorization.

43687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165 (or 86 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 43687 is about 209.0143535741. The cubic root of 43687 is about 35.2195720184.

Multiplying 43687 by its sum of digits (28), we get a square (1223236 = 1106²).

Multiplying 43687 by its product of digits (4032), we get a square (176145984 = 13272²).

The spelling of 43687 in words is "forty-three thousand, six hundred eighty-seven".