1397281 has 4 divisors (see below), whose sum is σ = 1479492. Its totient is φ = 1315072.

The previous prime is 1397267. The next prime is 1397287. The reversal of 1397281 is 1827931.

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

It can be written as a sum of positive squares in 2 ways, for example, as 429025 + 968256 = 655^2 + 984^2 .

It is a cyclic number.

It is not a de Polignac number, because 1397281 - 2⁷ = 1397153 is a prime.

It is a super-2 number, since 2×1397281² = 3904788385922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1397287) 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, 41080 + ... + 41113.

It is an arithmetic number, because the mean of its divisors is an integer number (369873).

2^1397281 is an apocalyptic number.

It is an amenable number.

1397281 is a deficient number, since it is larger than the sum of its proper divisors (82211).

1397281 is an equidigital number, since it uses as much as digits as its factorization.

1397281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82210.

The product of its digits is 3024, while the sum is 31.

The square root of 1397281 is about 1182.0664109939. The cubic root of 1397281 is about 111.7964254817.

The spelling of 1397281 in words is "one million, three hundred ninety-seven thousand, two hundred eighty-one".