1369645 has 4 divisors (see below), whose sum is σ = 1643580. Its totient is φ = 1095712.

The previous prime is 1369619. The next prime is 1369651. The reversal of 1369645 is 5469631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5469631 = 17 ⋅321743.

It can be written as a sum of positive squares in 2 ways, for example, as 1052676 + 316969 = 1026^2 + 563^2 .

It is a cyclic number.

It is not a de Polignac number, because 1369645 - 2⁷ = 1369517 is a prime.

It is a super-3 number, since 3×1369645³ = 7708063858254033375, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1369645.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136960 + ... + 136969.

It is an arithmetic number, because the mean of its divisors is an integer number (410895).

2^1369645 is an apocalyptic number.

It is an amenable number.

1369645 is a deficient number, since it is larger than the sum of its proper divisors (273935).

1369645 is an equidigital number, since it uses as much as digits as its factorization.

1369645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273934.

The product of its digits is 19440, while the sum is 34.

The square root of 1369645 is about 1170.3183327625. The cubic root of 1369645 is about 111.0544601950.

The spelling of 1369645 in words is "one million, three hundred sixty-nine thousand, six hundred forty-five".