99999398 has 4 divisors (see below), whose sum is σ = 149999100. Its totient is φ = 49999698.

The previous prime is 99999373. The next prime is 99999401. The reversal of 99999398 is 89399999.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999848 + ... + 24999851.

It is an arithmetic number, because the mean of its divisors is an integer number (37499775).

Almost surely, 2^99999398 is an apocalyptic number.

99999398 is a deficient number, since it is larger than the sum of its proper divisors (49999702).

99999398 is a wasteful number, since it uses less digits than its factorization.

99999398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49999701.

The product of its digits is 12754584, while the sum is 65.

The square root of 99999398 is about 9999.9698999547. The cubic root of 99999398 is about 464.1579519472.

The spelling of 99999398 in words is "ninety-nine million, nine hundred ninety-nine thousand, three hundred ninety-eight".