43867987 has 4 divisors (see below), whose sum is σ = 43898976. Its totient is φ = 43837000.

The previous prime is 43867961. The next prime is 43867997. The reversal of 43867987 is 78976834.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78976834 = 2 ⋅39488417.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43867987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43867937) 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, 13264 + ... + 16237.

It is an arithmetic number, because the mean of its divisors is an integer number (10974744).

Almost surely, 2^43867987 is an apocalyptic number.

43867987 is a deficient number, since it is larger than the sum of its proper divisors (30989).

43867987 is a wasteful number, since it uses less digits than its factorization.

43867987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30988.

The product of its digits is 2032128, while the sum is 52.

The square root of 43867987 is about 6623.2912513342. The cubic root of 43867987 is about 352.6814102364.

The spelling of 43867987 in words is "forty-three million, eight hundred sixty-seven thousand, nine hundred eighty-seven".