1366816 has 36 divisors (see below), whose sum is σ = 2966166. Its totient is φ = 619520.

The previous prime is 1366801. The next prime is 1366829. The reversal of 1366816 is 6186631.

1366816 = T₄₉₃ + T₄₉₄ + ... + T₅₀₃.

1366816 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 1210000 + 156816 = 1100^2 + 396^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3696 + ... + 4048.

2^1366816 is an apocalyptic number.

1366816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1366816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1483083).

1366816 is an abundant number, since it is smaller than the sum of its proper divisors (1599350).

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

1366816 is a wasteful number, since it uses less digits than its factorization.

1366816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 366 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 1366816 is about 1169.1090624916. The cubic root of 1366816 is about 110.9779465426.

The spelling of 1366816 in words is "one million, three hundred sixty-six thousand, eight hundred sixteen".