198719397 has 12 divisors (see below), whose sum is σ = 296937420. Its totient is φ = 127911168.

The previous prime is 198719329. The next prime is 198719401. The reversal of 198719397 is 793917891.

It can be written as a sum of positive squares in 2 ways, for example, as 85488516 + 113230881 = 9246^2 + 10641^2 .

It is not a de Polignac number, because 198719397 - 2⁸ = 198719141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198719327) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 380428 + ... + 380949.

It is an arithmetic number, because the mean of its divisors is an integer number (24744785).

Almost surely, 2^198719397 is an apocalyptic number.

It is an amenable number.

198719397 is a deficient number, since it is larger than the sum of its proper divisors (98218023).

198719397 is a wasteful number, since it uses less digits than its factorization.

198719397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761412 (or 761409 counting only the distinct ones).

The product of its digits is 857304, while the sum is 54.

The square root of 198719397 is about 14096.7867615283. The cubic root of 198719397 is about 583.5527054821.

The spelling of 198719397 in words is "one hundred ninety-eight million, seven hundred nineteen thousand, three hundred ninety-seven".