1355969 has 4 divisors (see below), whose sum is σ = 1378260. Its totient is φ = 1333680.

The previous prime is 1355957. The next prime is 1355983. The reversal of 1355969 is 9695531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9695531 = 701 ⋅13831.

It can be written as a sum of positive squares in 2 ways, for example, as 172225 + 1183744 = 415^2 + 1088^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355969 - 2⁸ = 1355713 is a prime.

It is a super-2 number, since 2×1355969² = 3677303857922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1355989) 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, 11054 + ... + 11175.

It is an arithmetic number, because the mean of its divisors is an integer number (344565).

2^1355969 is an apocalyptic number.

It is an amenable number.

1355969 is a deficient number, since it is larger than the sum of its proper divisors (22291).

1355969 is an equidigital number, since it uses as much as digits as its factorization.

1355969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22290.

The product of its digits is 36450, while the sum is 38.

The square root of 1355969 is about 1164.4608194353. The cubic root of 1355969 is about 110.6835942478.

It can be divided in two parts, 135 and 5969, that multiplied together give a triangular number (805815 = T₁₂₆₉).

The spelling of 1355969 in words is "one million, three hundred fifty-five thousand, nine hundred sixty-nine".