397819 has 4 divisors (see below), whose sum is σ = 402696. Its totient is φ = 392944.

The previous prime is 397811. The next prime is 397829. The reversal of 397819 is 918793.

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 397819 - 2³ = 397811 is a prime.

It is a super-4 number, since 4×397819⁴ (a number of 24 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

397819 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (397811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2314 + ... + 2479.

It is an arithmetic number, because the mean of its divisors is an integer number (100674).

2³⁹⁷⁸¹⁹ is an apocalyptic number.

397819 is a deficient number, since it is larger than the sum of its proper divisors (4877).

397819 is an equidigital number, since it uses as much as digits as its factorization.

397819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4876.

The product of its digits is 13608, while the sum is 37.

The square root of 397819 is about 630.7289433663. The cubic root of 397819 is about 73.5464712982.

The spelling of 397819 in words is "three hundred ninety-seven thousand, eight hundred nineteen".