1355869 has 4 divisors (see below), whose sum is σ = 1435644. Its totient is φ = 1276096.

The previous prime is 1355867. The next prime is 1355881. The reversal of 1355869 is 9685531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9685531 = 1627 ⋅5953.

It can be written as a sum of positive squares in 2 ways, for example, as 980100 + 375769 = 990^2 + 613^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355869 - 2¹ = 1355867 is a prime.

It is a super-2 number, since 2×1355869² = 3676761490322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355863) 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, 39862 + ... + 39895.

It is an arithmetic number, because the mean of its divisors is an integer number (358911).

2^1355869 is an apocalyptic number.

It is an amenable number.

1355869 is a deficient number, since it is larger than the sum of its proper divisors (79775).

1355869 is an equidigital number, since it uses as much as digits as its factorization.

1355869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79774.

The product of its digits is 32400, while the sum is 37.

The square root of 1355869 is about 1164.4178803162. The cubic root of 1355869 is about 110.6808732830.

The spelling of 1355869 in words is "one million, three hundred fifty-five thousand, eight hundred sixty-nine".