1239505 has 4 divisors (see below), whose sum is σ = 1487412. Its totient is φ = 991600.

The previous prime is 1239499. The next prime is 1239509. The reversal of 1239505 is 5059321.

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 370881 + 868624 = 609^2 + 932^2 .

It is not a de Polignac number, because 1239505 - 2⁷ = 1239377 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1239505.

It is not an unprimeable number, because it can be changed into a prime (1239509) 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, 123946 + ... + 123955.

It is an arithmetic number, because the mean of its divisors is an integer number (371853).

2^1239505 is an apocalyptic number.

It is an amenable number.

1239505 is a deficient number, since it is larger than the sum of its proper divisors (247907).

1239505 is an equidigital number, since it uses as much as digits as its factorization.

1239505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247906.

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 1239505 is about 1113.3305888190. The cubic root of 1239505 is about 107.4194095820.

The spelling of 1239505 in words is "one million, two hundred thirty-nine thousand, five hundred five".