99139847 has 4 divisors (see below), whose sum is σ = 99188880. Its totient is φ = 99090816.

The previous prime is 99139841. The next prime is 99139849. The reversal of 99139847 is 74893199.

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

It is a cyclic number.

It is not a de Polignac number, because 99139847 - 2²⁰ = 98091271 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99139795 and 99139804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99139841) 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, 21347 + ... + 25572.

It is an arithmetic number, because the mean of its divisors is an integer number (24797220).

Almost surely, 2^99139847 is an apocalyptic number.

99139847 is a deficient number, since it is larger than the sum of its proper divisors (49033).

99139847 is a wasteful number, since it uses less digits than its factorization.

99139847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49032.

The product of its digits is 489888, while the sum is 50.

The square root of 99139847 is about 9956.8994672036. The cubic root of 99139847 is about 462.8242237903.

The spelling of 99139847 in words is "ninety-nine million, one hundred thirty-nine thousand, eight hundred forty-seven".