1272635 has 16 divisors (see below), whose sum is σ = 1880256. Its totient is φ = 805248.

The previous prime is 1272631. The next prime is 1272641. The reversal of 1272635 is 5362721.

It is a cyclic number.

It is not a de Polignac number, because 1272635 - 2² = 1272631 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1272631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944 + ... + 1853.

It is an arithmetic number, because the mean of its divisors is an integer number (117516).

2^1272635 is an apocalyptic number.

1272635 is a deficient number, since it is larger than the sum of its proper divisors (607621).

1272635 is a wasteful number, since it uses less digits than its factorization.

1272635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2822.

The product of its digits is 2520, while the sum is 26.

The square root of 1272635 is about 1128.1112533789. Note that the first 3 decimals coincide. The cubic root of 1272635 is about 108.3680572449.

The spelling of 1272635 in words is "one million, two hundred seventy-two thousand, six hundred thirty-five".