1618225 has 18 divisors (see below), whose sum is σ = 2335974. Its totient is φ = 1108800.

The previous prime is 1618223. The next prime is 1618241. The reversal of 1618225 is 5228161.

It can be written as a sum of positive squares in 3 ways, for example, as 379456 + 1238769 = 616^2 + 1113^2 .

It is not a de Polignac number, because 1618225 - 2¹ = 1618223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1618225.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1618223) 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, 565 + ... + 1885.

2^1618225 is an apocalyptic number.

It is an amenable number.

1618225 is a deficient number, since it is larger than the sum of its proper divisors (717749).

1618225 is a wasteful number, since it uses less digits than its factorization.

1618225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1345 (or 1333 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 1618225 is about 1272.0947291770. The cubic root of 1618225 is about 117.4031191763.

It can be divided in two parts, 16182 and 25, that multiplied together give a triangular number (404550 = T₈₉₉).

The spelling of 1618225 in words is "one million, six hundred eighteen thousand, two hundred twenty-five".