1918225 has 9 divisors (see below), whose sum is σ = 2387217. Its totient is φ = 1529040.

The previous prime is 1918219. The next prime is 1918237. The reversal of 1918225 is 5228191.

The square root of 1918225 is 1385.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 439569 + 1478656 = 663^2 + 1216^2 .

It is not a de Polignac number, because 1918225 - 2⁵ = 1918193 is a prime.

It is a Duffinian number.

1918225 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1918193 and 1918202.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6787 + ... + 7063.

2^1918225 is an apocalyptic number.

1918225 is the 1385-th square number.

1918225 is the 693-rd centered octagonal number.

It is an amenable number.

1918225 is a deficient number, since it is larger than the sum of its proper divisors (468992).

1918225 is an frugal number, since it uses more digits than its factorization.

1918225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564 (or 282 counting only the distinct ones).

The product of its digits is 1440, while the sum is 28.

The cubic root of 1918225 is about 124.2509874730.

The spelling of 1918225 in words is "one million, nine hundred eighteen thousand, two hundred twenty-five".