1665530 has 16 divisors (see below), whose sum is σ = 3020544. Its totient is φ = 661200.

The previous prime is 1665529. The next prime is 1665533. The reversal of 1665530 is 355661.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 1665530.

It is not an unprimeable number, because it can be changed into a prime (1665533) 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 7 ways as a sum of consecutive naturals, for example, 959 + ... + 2061.

It is an arithmetic number, because the mean of its divisors is an integer number (188784).

2^1665530 is an apocalyptic number.

1665530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1665530 is a deficient number, since it is larger than the sum of its proper divisors (1355014).

1665530 is a wasteful number, since it uses less digits than its factorization.

1665530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 1665530 is about 1290.5541445441. The cubic root of 1665530 is about 118.5361506729.

The spelling of 1665530 in words is "one million, six hundred sixty-five thousand, five hundred thirty".