1247997 has 4 divisors (see below), whose sum is σ = 1664000. Its totient is φ = 831996.

The previous prime is 1247969. The next prime is 1248001. The reversal of 1247997 is 7997421.

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 not a de Polignac number, because 1247997 - 2¹⁴ = 1231613 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247947) 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, 207997 + ... + 208002.

It is an arithmetic number, because the mean of its divisors is an integer number (416000).

2^1247997 is an apocalyptic number.

It is an amenable number.

1247997 is a deficient number, since it is larger than the sum of its proper divisors (416003).

1247997 is an equidigital number, since it uses as much as digits as its factorization.

1247997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416002.

The product of its digits is 31752, while the sum is 39.

The square root of 1247997 is about 1117.1378607853. The cubic root of 1247997 is about 107.6641659722.

The spelling of 1247997 in words is "one million, two hundred forty-seven thousand, nine hundred ninety-seven".