397218670 has 8 divisors (see below), whose sum is σ = 714993624. Its totient is φ = 158887464.

The previous prime is 397218629. The next prime is 397218691. The reversal of 397218670 is 76812793.

It is a happy number.

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

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 19860924 + ... + 19860943.

It is an arithmetic number, because the mean of its divisors is an integer number (89374203).

Almost surely, 2^397218670 is an apocalyptic number.

397218670 is a deficient number, since it is larger than the sum of its proper divisors (317774954).

397218670 is a wasteful number, since it uses less digits than its factorization.

397218670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39721874.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 397218670 is about 19930.3454561129. The cubic root of 397218670 is about 735.0945749621.

The spelling of 397218670 in words is "three hundred ninety-seven million, two hundred eighteen thousand, six hundred seventy".