87143947 has 4 divisors (see below), whose sum is σ = 95066136. Its totient is φ = 79221760.

The previous prime is 87143897. The next prime is 87143957. The reversal of 87143947 is 74934178.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87143947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87143957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3961078 + ... + 3961099.

It is an arithmetic number, because the mean of its divisors is an integer number (23766534).

Almost surely, 2^87143947 is an apocalyptic number.

87143947 is a deficient number, since it is larger than the sum of its proper divisors (7922189).

87143947 is a wasteful number, since it uses less digits than its factorization.

87143947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7922188.

The product of its digits is 169344, while the sum is 43.

The square root of 87143947 is about 9335.0922330741. The cubic root of 87143947 is about 443.3490091253.

The spelling of 87143947 in words is "eighty-seven million, one hundred forty-three thousand, nine hundred forty-seven".