1366345 has 4 divisors (see below), whose sum is σ = 1639620. Its totient is φ = 1093072.

The previous prime is 1366333. The next prime is 1366349. The reversal of 1366345 is 5436631.

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

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 751689 = 784^2 + 867^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366345 - 2¹³ = 1358153 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1366349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136630 + ... + 136639.

It is an arithmetic number, because the mean of its divisors is an integer number (409905).

2^1366345 is an apocalyptic number.

It is an amenable number.

1366345 is a deficient number, since it is larger than the sum of its proper divisors (273275).

1366345 is an equidigital number, since it uses as much as digits as its factorization.

1366345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273274.

The product of its digits is 6480, while the sum is 28.

The square root of 1366345 is about 1168.9076096938. The cubic root of 1366345 is about 110.9651975410.

It can be divided in two parts, 1366 and 345, that added together give a triangular number (1711 = T₅₈).

The spelling of 1366345 in words is "one million, three hundred sixty-six thousand, three hundred forty-five".