1272636 has 72 divisors (see below), whose sum is σ = 3538080. Its totient is φ = 384384.

The previous prime is 1272631. The next prime is 1272641. The reversal of 1272636 is 6362721.

It is a happy number.

1272636 is a `hidden beast` number, since 1 + 27 + 2 + 636 = 666.

It is an interprime number because it is at equal distance from previous prime (1272631) and next prime (1272641).

It is a congruent number.

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

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23986 + ... + 24038.

It is an arithmetic number, because the mean of its divisors is an integer number (49140).

2^1272636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1272636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769040).

1272636 is an abundant number, since it is smaller than the sum of its proper divisors (2265444).

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

1272636 is a wasteful number, since it uses less digits than its factorization.

1272636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 110 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 1272636 is about 1128.1116965975. Note that the first 3 decimals coincide. The cubic root of 1272636 is about 108.3680856290.

The spelling of 1272636 in words is "one million, two hundred seventy-two thousand, six hundred thirty-six".