1665525 has 24 divisors (see below), whose sum is σ = 2812320. Its totient is φ = 869440.

The previous prime is 1665523. The next prime is 1665527. The reversal of 1665525 is 5255661.

It is an interprime number because it is at equal distance from previous prime (1665523) and next prime (1665527).

It is not a de Polignac number, because 1665525 - 2¹ = 1665523 is a prime.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1665492 and 1665501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3766 + ... + 4184.

It is an arithmetic number, because the mean of its divisors is an integer number (117180).

2^1665525 is an apocalyptic number.

1665525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1665525 is a deficient number, since it is larger than the sum of its proper divisors (1146795).

1665525 is a wasteful number, since it uses less digits than its factorization.

1665525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485 (or 480 counting only the distinct ones).

The product of its digits is 9000, while the sum is 30.

The square root of 1665525 is about 1290.5522073903. The cubic root of 1665525 is about 118.5360320557.

The spelling of 1665525 in words is "one million, six hundred sixty-five thousand, five hundred twenty-five".