87938921 has 8 divisors (see below), whose sum is σ = 100673664. Its totient is φ = 75247200.

The previous prime is 87938887. The next prime is 87938923. The reversal of 87938921 is 12983978.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 87938921 - 2²⁶ = 20830057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87938923) 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 7 ways as a sum of consecutive naturals, for example, 6245 + ... + 14658.

It is an arithmetic number, because the mean of its divisors is an integer number (12584208).

Almost surely, 2^87938921 is an apocalyptic number.

It is an amenable number.

87938921 is a deficient number, since it is larger than the sum of its proper divisors (12734743).

87938921 is a wasteful number, since it uses less digits than its factorization.

87938921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21511.

The product of its digits is 217728, while the sum is 47.

The square root of 87938921 is about 9377.5754329144. The cubic root of 87938921 is about 444.6930863566.

The spelling of 87938921 in words is "eighty-seven million, nine hundred thirty-eight thousand, nine hundred twenty-one".