397948417 has 4 divisors (see below), whose sum is σ = 402051076. Its totient is φ = 393845760.

The previous prime is 397948403. The next prime is 397948487. The reversal of 397948417 is 714849793.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 325766401 + 72182016 = 18049^2 + 8496^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397948417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397948487) by changing a digit.

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, 2051184 + ... + 2051377.

It is an arithmetic number, because the mean of its divisors is an integer number (100512769).

Almost surely, 2^397948417 is an apocalyptic number.

It is an amenable number.

397948417 is a deficient number, since it is larger than the sum of its proper divisors (4102659).

397948417 is an equidigital number, since it uses as much as digits as its factorization.

397948417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4102658.

The product of its digits is 1524096, while the sum is 52.

The square root of 397948417 is about 19948.6444902906. The cubic root of 397948417 is about 735.5444572184.

The spelling of 397948417 in words is "three hundred ninety-seven million, nine hundred forty-eight thousand, four hundred seventeen".