1212605 has 4 divisors (see below), whose sum is σ = 1455132. Its totient is φ = 970080.

The previous prime is 1212569. The next prime is 1212611. The reversal of 1212605 is 5062121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5062121 = 929 ⋅5449.

It can be written as a sum of positive squares in 2 ways, for example, as 582169 + 630436 = 763^2 + 794^2 .

It is not a de Polignac number, because 1212605 - 2¹⁸ = 950461 is a prime.

It is a Duffinian number.

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, 121256 + ... + 121265.

It is an arithmetic number, because the mean of its divisors is an integer number (363783).

2^1212605 is an apocalyptic number.

It is an amenable number.

1212605 is a deficient number, since it is larger than the sum of its proper divisors (242527).

1212605 is an equidigital number, since it uses as much as digits as its factorization.

1212605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242526.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1212605 is about 1101.1834542891. The cubic root of 1212605 is about 106.6366397686.

Adding to 1212605 its reverse (5062121), we get a palindrome (6274726).

The spelling of 1212605 in words is "one million, two hundred twelve thousand, six hundred five".