1681604940 has 24 divisors (see below), whose sum is σ = 4708494000. Its totient is φ = 448427968.

The previous prime is 1681604923. The next prime is 1681604941. The reversal of 1681604940 is 494061861.

It is not an unprimeable number, because it can be changed into a prime (1681604941) 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, 14013315 + ... + 14013434.

It is an arithmetic number, because the mean of its divisors is an integer number (196187250).

Almost surely, 2^1681604940 is an apocalyptic number.

1681604940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681604940 is an abundant number, since it is smaller than the sum of its proper divisors (3026889060).

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

1681604940 is a wasteful number, since it uses less digits than its factorization.

1681604940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28026761 (or 28026759 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1681604940 is about 41007.3766534754. The cubic root of 1681604940 is about 1189.1628271361.

The spelling of 1681604940 in words is "one billion, six hundred eighty-one million, six hundred four thousand, nine hundred forty".