1218725 has 18 divisors (see below), whose sum is σ = 1602390. Its totient is φ = 918400.

The previous prime is 1218709. The next prime is 1218727. The reversal of 1218725 is 5278121.

It can be written as a sum of positive squares in 9 ways, for example, as 954529 + 264196 = 977^2 + 514^2 .

It is not a de Polignac number, because 1218725 - 2⁴ = 1218709 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a plaindrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 1218694 and 1218703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218727) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 29705 + ... + 29745.

2^1218725 is an apocalyptic number.

It is an amenable number.

1218725 is a deficient number, since it is larger than the sum of its proper divisors (383665).

1218725 is an equidigital number, since it uses as much as digits as its factorization.

1218725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 75 counting only the distinct ones).

The product of its digits is 1120, while the sum is 26.

The square root of 1218725 is about 1103.9587854626. The cubic root of 1218725 is about 106.8157366684.

The spelling of 1218725 in words is "one million, two hundred eighteen thousand, seven hundred twenty-five".