1247397 has 4 divisors (see below), whose sum is σ = 1663200. Its totient is φ = 831596.

The previous prime is 1247383. The next prime is 1247401. The reversal of 1247397 is 7937421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1247397 - 2⁷ = 1247269 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247317) 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, 207897 + ... + 207902.

It is an arithmetic number, because the mean of its divisors is an integer number (415800).

2^1247397 is an apocalyptic number.

It is an amenable number.

1247397 is a deficient number, since it is larger than the sum of its proper divisors (415803).

1247397 is an equidigital number, since it uses as much as digits as its factorization.

1247397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415802.

The product of its digits is 10584, while the sum is 33.

The square root of 1247397 is about 1116.8692851001. The cubic root of 1247397 is about 107.6469092922.

The spelling of 1247397 in words is "one million, two hundred forty-seven thousand, three hundred ninety-seven".