1213505 has 8 divisors (see below), whose sum is σ = 1506600. Its totient is φ = 937216.

The previous prime is 1213483. The next prime is 1213517. The reversal of 1213505 is 5053121.

It can be written as a sum of positive squares in 4 ways, for example, as 229441 + 984064 = 479^2 + 992^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213505 - 2¹⁴ = 1197121 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4040 + ... + 4329.

It is an arithmetic number, because the mean of its divisors is an integer number (188325).

2^1213505 is an apocalyptic number.

It is an amenable number.

1213505 is a deficient number, since it is larger than the sum of its proper divisors (293095).

1213505 is an equidigital number, since it uses as much as digits as its factorization.

1213505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8403.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1213505 is about 1101.5920297460. The cubic root of 1213505 is about 106.6630152830.

Adding to 1213505 its reverse (5053121), we get a palindrome (6266626).

The spelling of 1213505 in words is "one million, two hundred thirteen thousand, five hundred five".