1684900980 has 96 divisors (see below), whose sum is σ = 5990772480. Its totient is φ = 385119360.

The previous prime is 1684900969. The next prime is 1684900993. The reversal of 1684900980 is 890094861.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219091 + ... + 226650.

It is an arithmetic number, because the mean of its divisors is an integer number (62403880).

Almost surely, 2^1684900980 is an apocalyptic number.

1684900980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1684900980 is an abundant number, since it is smaller than the sum of its proper divisors (4305871500).

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

1684900980 is a wasteful number, since it uses less digits than its factorization.

1684900980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445766 (or 445758 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 1684900980 is about 41047.5453590102. The cubic root of 1684900980 is about 1189.9392620178.

The spelling of 1684900980 in words is "one billion, six hundred eighty-four million, nine hundred thousand, nine hundred eighty".