1397287 has 2 divisors, whose sum is σ = 1397288. Its totient is φ = 1397286.

The previous prime is 1397267. The next prime is 1397303. The reversal of 1397287 is 7827931.

It is a strong prime.

It is an emirp because it is prime and its reverse (7827931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1397287 - 2⁷ = 1397159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1397257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698643 + 698644.

It is an arithmetic number, because the mean of its divisors is an integer number (698644).

2^1397287 is an apocalyptic number.

1397287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397287 is an equidigital number, since it uses as much as digits as its factorization.

1397287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 1397287 is about 1182.0689489196. The cubic root of 1397287 is about 111.7965855015.

The spelling of 1397287 in words is "one million, three hundred ninety-seven thousand, two hundred eighty-seven".