1990225 has 6 divisors (see below), whose sum is σ = 2467910. Its totient is φ = 1592160.

The previous prime is 1990223. The next prime is 1990229. The reversal of 1990225 is 5220991.

It can be written as a sum of positive squares in 3 ways, for example, as 266256 + 1723969 = 516^2 + 1313^2 .

It is not a de Polignac number, because 1990225 - 2¹ = 1990223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1990193 and 1990202.

It is not an unprimeable number, because it can be changed into a prime (1990223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39780 + ... + 39829.

2^1990225 is an apocalyptic number.

It is an amenable number.

1990225 is a deficient number, since it is larger than the sum of its proper divisors (477685).

1990225 is an equidigital number, since it uses as much as digits as its factorization.

1990225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79619 (or 79614 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1990225 is about 1410.7533448481. The cubic root of 1990225 is about 125.7865075346.

The spelling of 1990225 in words is "one million, nine hundred ninety thousand, two hundred twenty-five".