197947845 has 24 divisors (see below), whose sum is σ = 349587576. Its totient is φ = 103579008.

The previous prime is 197947843. The next prime is 197947853. The reversal of 197947845 is 548749791.

It can be written as a sum of positive squares in 4 ways, for example, as 47983329 + 149964516 = 6927^2 + 12246^2 .

It is not a de Polignac number, because 197947845 - 2¹ = 197947843 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 197947791 and 197947800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197947843) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39114 + ... + 43883.

It is an arithmetic number, because the mean of its divisors is an integer number (14566149).

Almost surely, 2^197947845 is an apocalyptic number.

197947845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

197947845 is a deficient number, since it is larger than the sum of its proper divisors (151639731).

197947845 is a wasteful number, since it uses less digits than its factorization.

197947845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83061 (or 83058 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 197947845 is about 14069.3939101867. The cubic root of 197947845 is about 582.7964880396.

The spelling of 197947845 in words is "one hundred ninety-seven million, nine hundred forty-seven thousand, eight hundred forty-five".