1681530 has 32 divisors (see below), whose sum is σ = 4212864. Its totient is φ = 428736.

The previous prime is 1681517. The next prime is 1681541. The reversal of 1681530 is 351861.

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 1681530.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 529 + ... + 1908.

It is an arithmetic number, because the mean of its divisors is an integer number (131652).

2^1681530 is an apocalyptic number.

1681530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1681530 is an abundant number, since it is smaller than the sum of its proper divisors (2531334).

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

1681530 is a wasteful number, since it uses less digits than its factorization.

1681530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2470.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 1681530 is about 1296.7382156781. The cubic root of 1681530 is about 118.9145162031.

It can be divided in two parts, 1681 and 530, that added together give a triangular number (2211 = T₆₆).

The spelling of 1681530 in words is "one million, six hundred eighty-one thousand, five hundred thirty".