397811378 has 8 divisors (see below), whose sum is σ = 606499500. Its totient is φ = 195644880.

The previous prime is 397811377. The next prime is 397811413. The reversal of 397811378 is 873118793.

It can be written as a sum of positive squares in 2 ways, for example, as 324828529 + 72982849 = 18023^2 + 8543^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (397811377) by changing a digit.

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, 1630253 + ... + 1630496.

Almost surely, 2^397811378 is an apocalyptic number.

397811378 is a deficient number, since it is larger than the sum of its proper divisors (208688122).

397811378 is a wasteful number, since it uses less digits than its factorization.

397811378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3260812.

The product of its digits is 254016, while the sum is 47.

The square root of 397811378 is about 19945.2093997531. The cubic root of 397811378 is about 735.4600159146.

The spelling of 397811378 in words is "three hundred ninety-seven million, eight hundred eleven thousand, three hundred seventy-eight".