197289945 has 16 divisors (see below), whose sum is σ = 350737920. Its totient is φ = 105221232.

The previous prime is 197289943. The next prime is 197289979. The reversal of 197289945 is 549982791.

It is not a de Polignac number, because 197289945 - 2¹ = 197289943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197289891 and 197289900.

It is not an unprimeable number, because it can be changed into a prime (197289941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 730569 + ... + 730838.

It is an arithmetic number, because the mean of its divisors is an integer number (21921120).

Almost surely, 2^197289945 is an apocalyptic number.

197289945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

197289945 is a deficient number, since it is larger than the sum of its proper divisors (153447975).

197289945 is a wasteful number, since it uses less digits than its factorization.

197289945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461421 (or 1461415 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 197289945 is about 14045.9939128564. The cubic root of 197289945 is about 582.1501100738.

The spelling of 197289945 in words is "one hundred ninety-seven million, two hundred eighty-nine thousand, nine hundred forty-five".