1366638 has 32 divisors (see below), whose sum is σ = 3365376. Its totient is φ = 360288.

The previous prime is 1366627. The next prime is 1366639. The reversal of 1366638 is 8366631.

It is a zygodrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 1366599 and 1366608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366639) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 706 + ... + 1797.

It is an arithmetic number, because the mean of its divisors is an integer number (105168).

2^1366638 is an apocalyptic number.

1366638 is an abundant number, since it is smaller than the sum of its proper divisors (1998738).

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

1366638 is a wasteful number, since it uses less digits than its factorization.

1366638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528.

The product of its digits is 15552, while the sum is 33.

The square root of 1366638 is about 1169.0329336678. The cubic root of 1366638 is about 110.9731287929.

Multiplying 1366638 by its sum of digits (33), we get a palindrome (45099054).

The spelling of 1366638 in words is "one million, three hundred sixty-six thousand, six hundred thirty-eight".