1366981 has 16 divisors (see below), whose sum is σ = 1749888. Its totient is φ = 1036800.

The previous prime is 1366979. The next prime is 1366991. The reversal of 1366981 is 1896631.

It is a 5-Lehmer number, since φ(1366981) divides (1366981-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 1366981 - 2¹ = 1366979 is a prime.

It is a super-2 number, since 2×1366981² = 3737274108722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366921) 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, 2941 + ... + 3373.

It is an arithmetic number, because the mean of its divisors is an integer number (109368).

2^1366981 is an apocalyptic number.

1366981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1366981 is a deficient number, since it is larger than the sum of its proper divisors (382907).

1366981 is a wasteful number, since it uses less digits than its factorization.

1366981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its digits is 7776, while the sum is 34.

The square root of 1366981 is about 1169.1796269180. The cubic root of 1366981 is about 110.9824120606.

It can be divided in two parts, 136 and 6981, that added together give a palindrome (7117).

The spelling of 1366981 in words is "one million, three hundred sixty-six thousand, nine hundred eighty-one".