1271638 has 8 divisors (see below), whose sum is σ = 1926288. Its totient is φ = 629544.

The previous prime is 1271609. The next prime is 1271657. The reversal of 1271638 is 8361721.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2881 + ... + 3292.

It is an arithmetic number, because the mean of its divisors is an integer number (240786).

2^1271638 is an apocalyptic number.

1271638 is a deficient number, since it is larger than the sum of its proper divisors (654650).

1271638 is a wasteful number, since it uses less digits than its factorization.

1271638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6278.

The product of its digits is 2016, while the sum is 28.

The square root of 1271638 is about 1127.6692777583. The cubic root of 1271638 is about 108.3397508361.

The spelling of 1271638 in words is "one million, two hundred seventy-one thousand, six hundred thirty-eight".