397127819 has 4 divisors (see below), whose sum is σ = 433230360. Its totient is φ = 361025280.

The previous prime is 397127777. The next prime is 397127839. The reversal of 397127819 is 918721793.

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

It is a de Polignac number, because none of the positive numbers 2^k-397127819 is a prime.

It is a super-2 number, since 2×397127819² = 315421009247393522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397127839) 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, 18051254 + ... + 18051275.

It is an arithmetic number, because the mean of its divisors is an integer number (108307590).

Almost surely, 2^397127819 is an apocalyptic number.

397127819 is a deficient number, since it is larger than the sum of its proper divisors (36102541).

397127819 is a wasteful number, since it uses less digits than its factorization.

397127819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36102540.

The product of its digits is 190512, while the sum is 47.

The square root of 397127819 is about 19928.0661128972. The cubic root of 397127819 is about 735.0385276054.

The spelling of 397127819 in words is "three hundred ninety-seven million, one hundred twenty-seven thousand, eight hundred nineteen".