1213825 has 12 divisors (see below), whose sum is σ = 1571328. Its totient is φ = 928400.

The previous prime is 1213801. The next prime is 1213829. The reversal of 1213825 is 5283121.

It is not a de Polignac number, because 1213825 - 2¹⁵ = 1181057 is a prime.

It is a super-2 number, since 2×1213825² = 2946742261250, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1213796 and 1213805.

It is not an unprimeable number, because it can be changed into a prime (1213829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 481 + ... + 1630.

It is an arithmetic number, because the mean of its divisors is an integer number (130944).

2^1213825 is an apocalyptic number.

It is an amenable number.

1213825 is a deficient number, since it is larger than the sum of its proper divisors (357503).

1213825 is a wasteful number, since it uses less digits than its factorization.

1213825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144 (or 2139 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 1213825 is about 1101.7372645055. The cubic root of 1213825 is about 106.6723901009.

Adding to 1213825 its reverse (5283121), we get a palindrome (6496946).

The spelling of 1213825 in words is "one million, two hundred thirteen thousand, eight hundred twenty-five".