1271647 has 8 divisors (see below), whose sum is σ = 1429344. Its totient is φ = 1122528.

The previous prime is 1271609. The next prime is 1271657. The reversal of 1271647 is 7461721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1271647 is a prime.

It is a Duffinian number.

1271647 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1828 + ... + 2425.

It is an arithmetic number, because the mean of its divisors is an integer number (178668).

2^1271647 is an apocalyptic number.

1271647 is a deficient number, since it is larger than the sum of its proper divisors (157697).

1271647 is a wasteful number, since it uses less digits than its factorization.

1271647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289.

The product of its digits is 2352, while the sum is 28.

The square root of 1271647 is about 1127.6732682830. The cubic root of 1271647 is about 108.3400064266.

The spelling of 1271647 in words is "one million, two hundred seventy-one thousand, six hundred forty-seven".