197390465 has 4 divisors (see below), whose sum is σ = 236868564. Its totient is φ = 157912368.

The previous prime is 197390399. The next prime is 197390471. The reversal of 197390465 is 564093791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 564093791 = 23 ⋅24525817.

It can be written as a sum of positive squares in 2 ways, for example, as 27583504 + 169806961 = 5252^2 + 13031^2 .

It is a cyclic number.

It is not a de Polignac number, because 197390465 - 2¹² = 197386369 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19739042 + ... + 19739051.

It is an arithmetic number, because the mean of its divisors is an integer number (59217141).

Almost surely, 2^197390465 is an apocalyptic number.

It is an amenable number.

197390465 is a deficient number, since it is larger than the sum of its proper divisors (39478099).

197390465 is an equidigital number, since it uses as much as digits as its factorization.

197390465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39478098.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 197390465 is about 14049.5717016570. The cubic root of 197390465 is about 582.2489625412.

The spelling of 197390465 in words is "one hundred ninety-seven million, three hundred ninety thousand, four hundred sixty-five".