1276638 has 48 divisors (see below), whose sum is σ = 3010176. Its totient is φ = 357280.

The previous prime is 1276637. The next prime is 1276657. The reversal of 1276638 is 8366721.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 1276599 and 1276608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276631) 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, 44008 + ... + 44036.

It is an arithmetic number, because the mean of its divisors is an integer number (62712).

2^1276638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1276638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1505088).

1276638 is an abundant number, since it is smaller than the sum of its proper divisors (1733538).

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

1276638 is a wasteful number, since it uses less digits than its factorization.

1276638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 68 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 1276638 is about 1129.8840648491. The cubic root of 1276638 is about 108.4815601472.

The spelling of 1276638 in words is "one million, two hundred seventy-six thousand, six hundred thirty-eight".