397818911 has 4 divisors (see below), whose sum is σ = 454650192. Its totient is φ = 340987632.

The previous prime is 397818907. The next prime is 397818913. The reversal of 397818911 is 119818793.

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

It is a cyclic number.

It is not a de Polignac number, because 397818911 - 2² = 397818907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397818913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28415630 + ... + 28415643.

It is an arithmetic number, because the mean of its divisors is an integer number (113662548).

Almost surely, 2^397818911 is an apocalyptic number.

397818911 is a deficient number, since it is larger than the sum of its proper divisors (56831281).

397818911 is an equidigital number, since it uses as much as digits as its factorization.

397818911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56831280.

The product of its digits is 108864, while the sum is 47.

The square root of 397818911 is about 19945.3982411984. The cubic root of 397818911 is about 735.4646581359.

The spelling of 397818911 in words is "three hundred ninety-seven million, eight hundred eighteen thousand, nine hundred eleven".