1247871 has 4 divisors (see below), whose sum is σ = 1663832. Its totient is φ = 831912.

The previous prime is 1247867. The next prime is 1247879. The reversal of 1247871 is 1787421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1787421 = 3 ⋅595807.

It is not a de Polignac number, because 1247871 - 2² = 1247867 is a prime.

It is a D-number.

It is a Duffinian number.

1247871 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1247879) 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, 207976 + ... + 207981.

It is an arithmetic number, because the mean of its divisors is an integer number (415958).

2^1247871 is an apocalyptic number.

1247871 is a deficient number, since it is larger than the sum of its proper divisors (415961).

1247871 is an equidigital number, since it uses as much as digits as its factorization.

1247871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415960.

The product of its digits is 3136, while the sum is 30.

The square root of 1247871 is about 1117.0814652477. The cubic root of 1247871 is about 107.6605425283.

The spelling of 1247871 in words is "one million, two hundred forty-seven thousand, eight hundred seventy-one".