197905945 has 8 divisors (see below), whose sum is σ = 238860936. Its totient is φ = 157408896.

The previous prime is 197905927. The next prime is 197905949. The reversal of 197905945 is 549509791.

It can be written as a sum of positive squares in 4 ways, for example, as 33143049 + 164762896 = 5757^2 + 12836^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 197905945 - 2¹³ = 197897753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197905949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 113532 + ... + 115261.

It is an arithmetic number, because the mean of its divisors is an integer number (29857617).

Almost surely, 2^197905945 is an apocalyptic number.

It is an amenable number.

197905945 is a deficient number, since it is larger than the sum of its proper divisors (40954991).

197905945 is a wasteful number, since it uses less digits than its factorization.

197905945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228971.

The product of its (nonzero) digits is 510300, while the sum is 49.

The square root of 197905945 is about 14067.9047835845. The cubic root of 197905945 is about 582.7553645878.

The spelling of 197905945 in words is "one hundred ninety-seven million, nine hundred five thousand, nine hundred forty-five".