1980818172 has 96 divisors (see below), whose sum is σ = 5723827200. Its totient is φ = 588715776.

The previous prime is 1980818171. The next prime is 1980818173. The reversal of 1980818172 is 2718180891.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1980818171) and next prime (1980818173).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980818171) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6493 + ... + 63275.

It is an arithmetic number, because the mean of its divisors is an integer number (59623200).

Almost surely, 2^1980818172 is an apocalyptic number.

1980818172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1980818172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2861913600).

1980818172 is an abundant number, since it is smaller than the sum of its proper divisors (3743009028).

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

1980818172 is a wasteful number, since it uses less digits than its factorization.

1980818172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56832 (or 56824 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 45.

The square root of 1980818172 is about 44506.3834972018. The cubic root of 1980818172 is about 1255.8801721795.

The spelling of 1980818172 in words is "one billion, nine hundred eighty million, eight hundred eighteen thousand, one hundred seventy-two".