87943979 has 4 divisors (see below), whose sum is σ = 90976560. Its totient is φ = 84911400.

The previous prime is 87943957. The next prime is 87943991. The reversal of 87943979 is 97934978.

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 87943979 - 2¹² = 87939883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87943939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1516247 + ... + 1516304.

It is an arithmetic number, because the mean of its divisors is an integer number (22744140).

Almost surely, 2^87943979 is an apocalyptic number.

87943979 is a deficient number, since it is larger than the sum of its proper divisors (3032581).

87943979 is a wasteful number, since it uses less digits than its factorization.

87943979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032580.

The product of its digits is 3429216, while the sum is 56.

The square root of 87943979 is about 9377.8451149504. The cubic root of 87943979 is about 444.7016120260.

Subtracting 87943979 from its reverse (97934978), we obtain a palindrome (9990999).

The spelling of 87943979 in words is "eighty-seven million, nine hundred forty-three thousand, nine hundred seventy-nine".