1898661680 has 20 divisors (see below), whose sum is σ = 4414388592. Its totient is φ = 759464640.

The previous prime is 1898661647. The next prime is 1898661683. The reversal of 1898661680 is 861668981.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (1898661683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11866556 + ... + 11866715.

Almost surely, 2^1898661680 is an apocalyptic number.

1898661680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1898661680 is an abundant number, since it is smaller than the sum of its proper divisors (2515726912).

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

1898661680 is a wasteful number, since it uses less digits than its factorization.

1898661680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23733284 (or 23733278 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 53.

The square root of 1898661680 is about 43573.6351478735. The cubic root of 1898661680 is about 1238.2714555810.

The spelling of 1898661680 in words is "one billion, eight hundred ninety-eight million, six hundred sixty-one thousand, six hundred eighty".