1665225 has 24 divisors (see below), whose sum is σ = 3060320. Its totient is φ = 887760.

The previous prime is 1665221. The next prime is 1665233. The reversal of 1665225 is 5225661.

1665225 is a `hidden beast` number, since 1 + 6 + 652 + 2 + 5 = 666.

It is not a de Polignac number, because 1665225 - 2² = 1665221 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1665221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 559 + ... + 1908.

2^1665225 is an apocalyptic number.

1665225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1665225 is a deficient number, since it is larger than the sum of its proper divisors (1395095).

1665225 is a wasteful number, since it uses less digits than its factorization.

1665225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2486 (or 2475 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 1665225 is about 1290.4359728402. The cubic root of 1665225 is about 118.5289145913.

The spelling of 1665225 in words is "one million, six hundred sixty-five thousand, two hundred twenty-five".