99984557 has 4 divisors (see below), whose sum is σ = 102111936. Its totient is φ = 97857180.

The previous prime is 99984541. The next prime is 99984559. The reversal of 99984557 is 75548999.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 99984557 - 2⁴ = 99984541 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 (99984559) 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, 1063619 + ... + 1063712.

It is an arithmetic number, because the mean of its divisors is an integer number (25527984).

Almost surely, 2^99984557 is an apocalyptic number.

It is an amenable number.

99984557 is a deficient number, since it is larger than the sum of its proper divisors (2127379).

99984557 is a wasteful number, since it uses less digits than its factorization.

99984557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2127378.

The product of its digits is 4082400, while the sum is 56.

The square root of 99984557 is about 9999.2278201869. The cubic root of 99984557 is about 464.1349887791.

The spelling of 99984557 in words is "ninety-nine million, nine hundred eighty-four thousand, five hundred fifty-seven".