99138488 has 8 divisors (see below), whose sum is σ = 185884680. Its totient is φ = 49569240.

The previous prime is 99138449. The next prime is 99138517. The reversal of 99138488 is 88483199.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×99138488² = 19656879605852288, which contains 22 as substring.

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, 6196148 + ... + 6196163.

It is an arithmetic number, because the mean of its divisors is an integer number (23235585).

Almost surely, 2^99138488 is an apocalyptic number.

It is an amenable number.

99138488 is a deficient number, since it is larger than the sum of its proper divisors (86746192).

99138488 is a wasteful number, since it uses less digits than its factorization.

99138488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12392317 (or 12392313 counting only the distinct ones).

The product of its digits is 497664, while the sum is 50.

The square root of 99138488 is about 9956.8312228339. The cubic root of 99138488 is about 462.8221089965.

The spelling of 99138488 in words is "ninety-nine million, one hundred thirty-eight thousand, four hundred eighty-eight".