397838387 has 2 divisors, whose sum is σ = 397838388. Its totient is φ = 397838386.

The previous prime is 397838351. The next prime is 397838411. The reversal of 397838387 is 783838793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397838387 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397838687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198919193 + 198919194.

It is an arithmetic number, because the mean of its divisors is an integer number (198919194).

Almost surely, 2^397838387 is an apocalyptic number.

397838387 is a deficient number, since it is larger than the sum of its proper divisors (1).

397838387 is an equidigital number, since it uses as much as digits as its factorization.

397838387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6096384, while the sum is 56.

The square root of 397838387 is about 19945.8864681417. The cubic root of 397838387 is about 735.4766599752.

The spelling of 397838387 in words is "three hundred ninety-seven million, eight hundred thirty-eight thousand, three hundred eighty-seven".