197643745 has 16 divisors (see below), whose sum is σ = 256858560. Its totient is φ = 145128384.

The previous prime is 197643737. The next prime is 197643763. The reversal of 197643745 is 547346791.

It is a cyclic number.

It is not a de Polignac number, because 197643745 - 2³ = 197643737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197643695 and 197643704.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 3142 + ... + 20128.

It is an arithmetic number, because the mean of its divisors is an integer number (16053660).

Almost surely, 2^197643745 is an apocalyptic number.

It is an amenable number.

197643745 is a deficient number, since it is larger than the sum of its proper divisors (59214815).

197643745 is a wasteful number, since it uses less digits than its factorization.

197643745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17184.

The product of its digits is 635040, while the sum is 46.

The square root of 197643745 is about 14058.5826099220. The cubic root of 197643745 is about 582.4978921375.

The spelling of 197643745 in words is "one hundred ninety-seven million, six hundred forty-three thousand, seven hundred forty-five".