1355645 has 4 divisors (see below), whose sum is σ = 1626780. Its totient is φ = 1084512.

The previous prime is 1355623. The next prime is 1355647. The reversal of 1355645 is 5465531.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1026169 + 329476 = 1013^2 + 574^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355645 - 2¹⁶ = 1290109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1355647) 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, 135560 + ... + 135569.

It is an arithmetic number, because the mean of its divisors is an integer number (406695).

2^1355645 is an apocalyptic number.

It is an amenable number.

1355645 is a deficient number, since it is larger than the sum of its proper divisors (271135).

1355645 is an equidigital number, since it uses as much as digits as its factorization.

1355645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271134.

The product of its digits is 9000, while the sum is 29.

The square root of 1355645 is about 1164.3216909428. The cubic root of 1355645 is about 110.6747778365.

The spelling of 1355645 in words is "one million, three hundred fifty-five thousand, six hundred forty-five".