1239445 has 4 divisors (see below), whose sum is σ = 1487340. Its totient is φ = 991552.

The previous prime is 1239443. The next prime is 1239449. The reversal of 1239445 is 5449321.

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 418609 + 820836 = 647^2 + 906^2 .

It is a cyclic number.

It is not a de Polignac number, because 1239445 - 2¹ = 1239443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1239443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123940 + ... + 123949.

It is an arithmetic number, because the mean of its divisors is an integer number (371835).

2^1239445 is an apocalyptic number.

It is an amenable number.

1239445 is a deficient number, since it is larger than the sum of its proper divisors (247895).

1239445 is an equidigital number, since it uses as much as digits as its factorization.

1239445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247894.

The product of its digits is 4320, while the sum is 28.

The square root of 1239445 is about 1113.3036423187. The cubic root of 1239445 is about 107.4176762910.

The spelling of 1239445 in words is "one million, two hundred thirty-nine thousand, four hundred forty-five".