9975398399 has 8 divisors (see below), whose sum is σ = 10189745568. Its totient is φ = 9763102720.

The previous prime is 9975398383. The next prime is 9975398413. The reversal of 9975398399 is 9938935799.

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

It is a cyclic number.

It is not a de Polignac number, because 9975398399 - 2⁴ = 9975398383 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (71).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9975395399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503042 + ... + 522495.

It is an arithmetic number, because the mean of its divisors is an integer number (1273718196).

Almost surely, 2^9975398399 is an apocalyptic number.

9975398399 is a deficient number, since it is larger than the sum of its proper divisors (214347169).

9975398399 is a wasteful number, since it uses less digits than its factorization.

9975398399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025745.

The product of its digits is 148803480, while the sum is 71.

The square root of 9975398399 is about 99876.9162469487. The cubic root of 9975398399 is about 2152.6664877972. Note that the first 3 decimals are identical.

The spelling of 9975398399 in words is "nine billion, nine hundred seventy-five million, three hundred ninety-eight thousand, three hundred ninety-nine".