1405189 has 4 divisors (see below), whose sum is σ = 1431756. Its totient is φ = 1378624.

The previous prime is 1405181. The next prime is 1405207. The reversal of 1405189 is 9815041.

It is a happy number.

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 613089 + 792100 = 783^2 + 890^2 .

It is a cyclic number.

It is not a de Polignac number, because 1405189 - 2³ = 1405181 is a prime.

It is a super-2 number, since 2×1405189² = 3949112251442, 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 (1405181) 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, 13204 + ... + 13309.

It is an arithmetic number, because the mean of its divisors is an integer number (357939).

2^1405189 is an apocalyptic number.

It is an amenable number.

1405189 is a deficient number, since it is larger than the sum of its proper divisors (26567).

1405189 is an equidigital number, since it uses as much as digits as its factorization.

1405189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26566.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1405189 is about 1185.4066812702. The cubic root of 1405189 is about 112.0069351573.

It can be divided in two parts, 140 and 5189, that added together give a square (5329 = 73²).

The spelling of 1405189 in words is "one million, four hundred five thousand, one hundred eighty-nine".