99997391 has 8 divisors (see below), whose sum is σ = 107775360. Its totient is φ = 92231712.

The previous prime is 99997369. The next prime is 99997393. The reversal of 99997391 is 19379999.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99997391 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 (99997393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20681 + ... + 25053.

It is an arithmetic number, because the mean of its divisors is an integer number (13471920).

Almost surely, 2^99997391 is an apocalyptic number.

99997391 is a deficient number, since it is larger than the sum of its proper divisors (7777969).

99997391 is a wasteful number, since it uses less digits than its factorization.

99997391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6145.

The product of its digits is 1240029, while the sum is 56.

The square root of 99997391 is about 9999.8695491491. The cubic root of 99997391 is about 464.1548466911.

The spelling of 99997391 in words is "ninety-nine million, nine hundred ninety-seven thousand, three hundred ninety-one".