198739397 has 2 divisors, whose sum is σ = 198739398. Its totient is φ = 198739396.

The previous prime is 198739381. The next prime is 198739439. The reversal of 198739397 is 793937891.

198739397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195049156 + 3690241 = 13966^2 + 1921^2 .

198739397 is a truncatable prime.

It is an emirp because it is prime and its reverse (793937891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198739397 - 2⁴ = 198739381 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198739327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99369698 + 99369699.

It is an arithmetic number, because the mean of its divisors is an integer number (99369699).

Almost surely, 2^198739397 is an apocalyptic number.

It is an amenable number.

198739397 is a deficient number, since it is larger than the sum of its proper divisors (1).

198739397 is an equidigital number, since it uses as much as digits as its factorization.

198739397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2571912, while the sum is 56.

The square root of 198739397 is about 14097.4961251990. The cubic root of 198739397 is about 583.5722819347.

The spelling of 198739397 in words is "one hundred ninety-eight million, seven hundred thirty-nine thousand, three hundred ninety-seven".