99999538 has 8 divisors (see below), whose sum is σ = 156521088. Its totient is φ = 47825844.

The previous prime is 99999517. The next prime is 99999539. The reversal of 99999538 is 83599999.

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

It is not an unprimeable number, because it can be changed into a prime (99999539) 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, 1086906 + ... + 1086997.

It is an arithmetic number, because the mean of its divisors is an integer number (19565136).

Almost surely, 2^99999538 is an apocalyptic number.

99999538 is a deficient number, since it is larger than the sum of its proper divisors (56521550).

99999538 is a wasteful number, since it uses less digits than its factorization.

99999538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2173928.

The product of its digits is 7085880, while the sum is 61.

The square root of 99999538 is about 9999.9768999733. The cubic root of 99999538 is about 464.1581685555.

The spelling of 99999538 in words is "ninety-nine million, nine hundred ninety-nine thousand, five hundred thirty-eight".