99821487 has 8 divisors (see below), whose sum is σ = 133160704. Its totient is φ = 66514968.

The previous prime is 99821479. The next prime is 99821521. The reversal of 99821487 is 78412899.

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

It is not a de Polignac number, because 99821487 - 2³ = 99821479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99821417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168 + ... + 14130.

It is an arithmetic number, because the mean of its divisors is an integer number (16645088).

Almost surely, 2^99821487 is an apocalyptic number.

99821487 is a deficient number, since it is larger than the sum of its proper divisors (33339217).

99821487 is a wasteful number, since it uses less digits than its factorization.

99821487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16349.

The product of its digits is 290304, while the sum is 48.

The square root of 99821487 is about 9991.0703630792. The cubic root of 99821487 is about 463.8825242012.

The spelling of 99821487 in words is "ninety-nine million, eight hundred twenty-one thousand, four hundred eighty-seven".