1272905 has 8 divisors (see below), whose sum is σ = 1608000. Its totient is φ = 964656.

The previous prime is 1272899. The next prime is 1272913. The reversal of 1272905 is 5092721.

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-1272905 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6605 + ... + 6794.

It is an arithmetic number, because the mean of its divisors is an integer number (201000).

2^1272905 is an apocalyptic number.

It is an amenable number.

1272905 is a deficient number, since it is larger than the sum of its proper divisors (335095).

1272905 is a wasteful number, since it uses less digits than its factorization.

1272905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13423.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 1272905 is about 1128.2309160806. The cubic root of 1272905 is about 108.3757204284.

The spelling of 1272905 in words is "one million, two hundred seventy-two thousand, nine hundred five".