397890379 has 2 divisors, whose sum is σ = 397890380. Its totient is φ = 397890378.

The previous prime is 397890377. The next prime is 397890397. The reversal of 397890379 is 973098793.

Together with next prime (397890397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (973098793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397890379 - 2¹ = 397890377 is a prime.

Together with 397890377, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (397890371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198945189 + 198945190.

It is an arithmetic number, because the mean of its divisors is an integer number (198945190).

Almost surely, 2^397890379 is an apocalyptic number.

397890379 is a deficient number, since it is larger than the sum of its proper divisors (1).

397890379 is an equidigital number, since it uses as much as digits as its factorization.

397890379 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 55.

The square root of 397890379 is about 19947.1897519425. The cubic root of 397890379 is about 735.5086974709.

The spelling of 397890379 in words is "three hundred ninety-seven million, eight hundred ninety thousand, three hundred seventy-nine".