1247605 has 4 divisors (see below), whose sum is σ = 1497132. Its totient is φ = 998080.

The previous prime is 1247599. The next prime is 1247611. The reversal of 1247605 is 5067421.

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

It is an interprime number because it is at equal distance from previous prime (1247599) and next prime (1247611).

It can be written as a sum of positive squares in 2 ways, for example, as 552049 + 695556 = 743^2 + 834^2 .

It is not a de Polignac number, because 1247605 - 2¹¹ = 1245557 is a prime.

It is a Duffinian number.

1247605 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1247605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124756 + ... + 124765.

It is an arithmetic number, because the mean of its divisors is an integer number (374283).

2^1247605 is an apocalyptic number.

It is an amenable number.

1247605 is a deficient number, since it is larger than the sum of its proper divisors (249527).

1247605 is an equidigital number, since it uses as much as digits as its factorization.

1247605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249526.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 1247605 is about 1116.9623986509. The cubic root of 1247605 is about 107.6528922345.

The spelling of 1247605 in words is "one million, two hundred forty-seven thousand, six hundred five".