87843971 has 4 divisors (see below), whose sum is σ = 88956000. Its totient is φ = 86731944.

The previous prime is 87843967. The next prime is 87843991. The reversal of 87843971 is 17934878.

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 87843971 - 2² = 87843967 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87843911) 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, 555896 + ... + 556053.

It is an arithmetic number, because the mean of its divisors is an integer number (22239000).

Almost surely, 2^87843971 is an apocalyptic number.

87843971 is a deficient number, since it is larger than the sum of its proper divisors (1112029).

87843971 is a wasteful number, since it uses less digits than its factorization.

87843971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112028.

The product of its digits is 338688, while the sum is 47.

The square root of 87843971 is about 9372.5114563814. The cubic root of 87843971 is about 444.5329797210.

The spelling of 87843971 in words is "eighty-seven million, eight hundred forty-three thousand, nine hundred seventy-one".