43873987 has 4 divisors (see below), whose sum is σ = 43897816. Its totient is φ = 43850160.

The previous prime is 43873981. The next prime is 43873997. The reversal of 43873987 is 78937834.

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

It is a cyclic number.

It is not a de Polignac number, because 43873987 - 2⁷ = 43873859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 43873987.

It is not an unprimeable number, because it can be changed into a prime (43873981) 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, 8898 + ... + 12919.

It is an arithmetic number, because the mean of its divisors is an integer number (10974454).

Almost surely, 2^43873987 is an apocalyptic number.

43873987 is a deficient number, since it is larger than the sum of its proper divisors (23829).

43873987 is a wasteful number, since it uses less digits than its factorization.

43873987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23828.

The product of its digits is 1016064, while the sum is 49.

The square root of 43873987 is about 6623.7441828621. The cubic root of 43873987 is about 352.6974887189.

The spelling of 43873987 in words is "forty-three million, eight hundred seventy-three thousand, nine hundred eighty-seven".