99997207 has 4 divisors (see below), whose sum is σ = 100066120. Its totient is φ = 99928296.

The previous prime is 99997189. The next prime is 99997243. The reversal of 99997207 is 70279999.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70279999 = 857 ⋅82007.

It is a cyclic number.

It is not a de Polignac number, because 99997207 - 2²³ = 91608599 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 (99997267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32232 + ... + 35197.

It is an arithmetic number, because the mean of its divisors is an integer number (25016530).

Almost surely, 2^99997207 is an apocalyptic number.

99997207 is a deficient number, since it is larger than the sum of its proper divisors (68913).

99997207 is a wasteful number, since it uses less digits than its factorization.

99997207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68912.

The product of its (nonzero) digits is 642978, while the sum is 52.

The square root of 99997207 is about 9999.8603490249. The cubic root of 99997207 is about 464.1545620018.

The spelling of 99997207 in words is "ninety-nine million, nine hundred ninety-seven thousand, two hundred seven".