197498839 has 2 divisors, whose sum is σ = 197498840. Its totient is φ = 197498838.

The previous prime is 197498837. The next prime is 197498857. The reversal of 197498839 is 938894791.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 197498839 - 2¹ = 197498837 is a prime.

Together with 197498837, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197498831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98749419 + 98749420.

It is an arithmetic number, because the mean of its divisors is an integer number (98749420).

Almost surely, 2^197498839 is an apocalyptic number.

197498839 is a deficient number, since it is larger than the sum of its proper divisors (1).

197498839 is an equidigital number, since it uses as much as digits as its factorization.

197498839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 58.

The square root of 197498839 is about 14053.4280159682. The cubic root of 197498839 is about 582.3555011295.

The spelling of 197498839 in words is "one hundred ninety-seven million, four hundred ninety-eight thousand, eight hundred thirty-nine".