99138415 has 4 divisors (see below), whose sum is σ = 118966104. Its totient is φ = 79310728.

The previous prime is 99138397. The next prime is 99138419. The reversal of 99138415 is 51483199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51483199 = 1091 ⋅47189.

It is a cyclic number.

It is not a de Polignac number, because 99138415 - 2⁹ = 99137903 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 (99138419) 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, 9913837 + ... + 9913846.

It is an arithmetic number, because the mean of its divisors is an integer number (29741526).

Almost surely, 2^99138415 is an apocalyptic number.

99138415 is a deficient number, since it is larger than the sum of its proper divisors (19827689).

99138415 is a wasteful number, since it uses less digits than its factorization.

99138415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19827688.

The product of its digits is 38880, while the sum is 40.

The square root of 99138415 is about 9956.8275570083. The cubic root of 99138415 is about 462.8219953978.

The spelling of 99138415 in words is "ninety-nine million, one hundred thirty-eight thousand, four hundred fifteen".