99997239 has 16 divisors (see below), whose sum is σ = 135928800. Its totient is φ = 65372160.

The previous prime is 99997189. The next prime is 99997243. The reversal of 99997239 is 93279999.

It is not a de Polignac number, because 99997239 - 2⁸ = 99996983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99990239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81559 + ... + 82775.

It is an arithmetic number, because the mean of its divisors is an integer number (8495550).

Almost surely, 2^99997239 is an apocalyptic number.

99997239 is a deficient number, since it is larger than the sum of its proper divisors (35931561).

99997239 is a wasteful number, since it uses less digits than its factorization.

99997239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730.

The product of its digits is 2480058, while the sum is 57.

The square root of 99997239 is about 9999.8619490471. The cubic root of 99997239 is about 464.1546115130.

The spelling of 99997239 in words is "ninety-nine million, nine hundred ninety-seven thousand, two hundred thirty-nine".