1356669 has 14 divisors (see below), whose sum is σ = 2035166. Its totient is φ = 903960.

The previous prime is 1356659. The next prime is 1356671. The reversal of 1356669 is 9666531.

It can be written as a sum of positive squares in only one way, i.e., 700569 + 656100 = 837^2 + 810^2 .

It is not a de Polignac number, because 1356669 - 2²⁰ = 308093 is a prime.

It is a super-2 number, since 2×1356669² = 3681101551122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1356629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 202 + ... + 1659.

It is an arithmetic number, because the mean of its divisors is an integer number (145369).

2^1356669 is an apocalyptic number.

It is an amenable number.

1356669 is a deficient number, since it is larger than the sum of its proper divisors (678497).

1356669 is an frugal number, since it uses more digits than its factorization.

1356669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1879 (or 1864 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 1356669 is about 1164.7613489466. The cubic root of 1356669 is about 110.7026372562.

It can be divided in two parts, 1356 and 669, that added together give a square (2025 = 45²).

The spelling of 1356669 in words is "one million, three hundred fifty-six thousand, six hundred sixty-nine".