1355689 has 4 divisors (see below), whose sum is σ = 1414656. Its totient is φ = 1296724.

The previous prime is 1355681. The next prime is 1355693. The reversal of 1355689 is 9865531.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9865531 = 13 ⋅758887.

It is a cyclic number.

It is not a de Polignac number, because 1355689 - 2³ = 1355681 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1355681) 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, 29449 + ... + 29494.

It is an arithmetic number, because the mean of its divisors is an integer number (353664).

2^1355689 is an apocalyptic number.

It is an amenable number.

1355689 is a deficient number, since it is larger than the sum of its proper divisors (58967).

1355689 is an equidigital number, since it uses as much as digits as its factorization.

1355689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58966.

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

The square root of 1355689 is about 1164.3405859112. The cubic root of 1355689 is about 110.6759752093.

The spelling of 1355689 in words is "one million, three hundred fifty-five thousand, six hundred eighty-nine".