193998397 has 4 divisors (see below), whose sum is σ = 194293440. Its totient is φ = 193703356.

The previous prime is 193998349. The next prime is 193998401. The reversal of 193998397 is 793899391.

193998397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 793899391 = 12703 ⋅62497.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193998397 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 (193998697) 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, 146533 + ... + 147850.

It is an arithmetic number, because the mean of its divisors is an integer number (48573360).

Almost surely, 2^193998397 is an apocalyptic number.

It is an amenable number.

193998397 is a deficient number, since it is larger than the sum of its proper divisors (295043).

193998397 is an equidigital number, since it uses as much as digits as its factorization.

193998397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295042.

The product of its digits is 3306744, while the sum is 58.

The square root of 193998397 is about 13928.3307327188. The cubic root of 193998397 is about 578.8944427511.

The spelling of 193998397 in words is "one hundred ninety-three million, nine hundred ninety-eight thousand, three hundred ninety-seven".