43987 has 2 divisors, whose sum is σ = 43988. Its totient is φ = 43986.

The previous prime is 43973. The next prime is 43991. The reversal of 43987 is 78934.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43987 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 43987.

It is not a weakly prime, because it can be changed into another prime (43997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21993 + 21994.

It is an arithmetic number, because the mean of its divisors is an integer number (21994).

2⁴³⁹⁸⁷ is an apocalyptic number.

43987 is a deficient number, since it is larger than the sum of its proper divisors (1).

43987 is an equidigital number, since it uses as much as digits as its factorization.

43987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 43987 is about 209.7307798107. The cubic root of 43987 is about 35.3000061526.

Subtracting from 43987 its sum of digits (31), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 43987 in words is "forty-three thousand, nine hundred eighty-seven".