1664530 has 48 divisors (see below), whose sum is σ = 3611520. Its totient is φ = 550368.

The previous prime is 1664501. The next prime is 1664543. The reversal of 1664530 is 354661.

It is a junction number, because it is equal to n+sod(n) for n = 1664495 and 1664504.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21031 + ... + 21109.

It is an arithmetic number, because the mean of its divisors is an integer number (75240).

2^1664530 is an apocalyptic number.

1664530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1664530 is an abundant number, since it is smaller than the sum of its proper divisors (1946990).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1664530 is a wasteful number, since it uses less digits than its factorization.

1664530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 1664530 is about 1290.1666559015. The cubic root of 1664530 is about 118.5124225139.

It can be divided in two parts, 16 and 64530, that added together give a palindrome (64546).

The spelling of 1664530 in words is "one million, six hundred sixty-four thousand, five hundred thirty".