397099387 has 2 divisors, whose sum is σ = 397099388. Its totient is φ = 397099386.

The previous prime is 397099361. The next prime is 397099403. The reversal of 397099387 is 783990793.

It is a strong prime.

It is an emirp because it is prime and its reverse (783990793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397099387 - 2²³ = 388710779 is a prime.

It is a super-3 number, since 3×397099387³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397099187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198549693 + 198549694.

It is an arithmetic number, because the mean of its divisors is an integer number (198549694).

Almost surely, 2^397099387 is an apocalyptic number.

397099387 is a deficient number, since it is larger than the sum of its proper divisors (1).

397099387 is an equidigital number, since it uses as much as digits as its factorization.

397099387 is an odious number, because the sum of its binary digits is odd.

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

The square root of 397099387 is about 19927.3527343699. The cubic root of 397099387 is about 735.0209857182.

The spelling of 397099387 in words is "three hundred ninety-seven million, ninety-nine thousand, three hundred eighty-seven".