197838749 has 4 divisors (see below), whose sum is σ = 198463164. Its totient is φ = 197214336.

The previous prime is 197838733. The next prime is 197838779. The reversal of 197838749 is 947838791.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71995225 + 125843524 = 8485^2 + 11218^2 .

It is a cyclic number.

It is not a de Polignac number, because 197838749 - 2⁴ = 197838733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 197838694 and 197838703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197838779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 311732 + ... + 312365.

It is an arithmetic number, because the mean of its divisors is an integer number (49615791).

Almost surely, 2^197838749 is an apocalyptic number.

It is an amenable number.

197838749 is a deficient number, since it is larger than the sum of its proper divisors (624415).

197838749 is an equidigital number, since it uses as much as digits as its factorization.

197838749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624414.

The product of its digits is 3048192, while the sum is 56.

The square root of 197838749 is about 14065.5163076227. The cubic root of 197838749 is about 582.6894018359.

The spelling of 197838749 in words is "one hundred ninety-seven million, eight hundred thirty-eight thousand, seven hundred forty-nine".