1272638 has 4 divisors (see below), whose sum is σ = 1908960. Its totient is φ = 636318.

The previous prime is 1272631. The next prime is 1272641. The reversal of 1272638 is 8362721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1272638.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318158 + ... + 318161.

It is an arithmetic number, because the mean of its divisors is an integer number (477240).

2^1272638 is an apocalyptic number.

1272638 is a deficient number, since it is larger than the sum of its proper divisors (636322).

1272638 is an equidigital number, since it uses as much as digits as its factorization.

1272638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636321.

The product of its digits is 4032, while the sum is 29.

The square root of 1272638 is about 1128.1125830342. The cubic root of 1272638 is about 108.3681423973.

The spelling of 1272638 in words is "one million, two hundred seventy-two thousand, six hundred thirty-eight".