1271664 has 30 divisors (see below), whose sum is σ = 3559296. Its totient is φ = 423840.

The previous prime is 1271659. The next prime is 1271671. The reversal of 1271664 is 4661721.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4272 + ... + 4559.

2^1271664 is an apocalyptic number.

It is an amenable number.

1271664 is an abundant number, since it is smaller than the sum of its proper divisors (2287632).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1271664 is a wasteful number, since it uses less digits than its factorization.

1271664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8845 (or 8836 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 1271664 is about 1127.6808059021. The cubic root of 1271664 is about 108.3404892052.

The spelling of 1271664 in words is "one million, two hundred seventy-one thousand, six hundred sixty-four".