1980129918 has 32 divisors (see below), whose sum is σ = 4411965600. Its totient is φ = 588260736.

The previous prime is 1980129917. The next prime is 1980129923. The reversal of 1980129918 is 8199210891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980129917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435433 + ... + 439956.

It is an arithmetic number, because the mean of its divisors is an integer number (137873925).

Almost surely, 2^1980129918 is an apocalyptic number.

1980129918 is an abundant number, since it is smaller than the sum of its proper divisors (2431835682).

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

1980129918 is a wasteful number, since it uses less digits than its factorization.

1980129918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875436.

The product of its (nonzero) digits is 93312, while the sum is 48.

The square root of 1980129918 is about 44498.6507435900. The cubic root of 1980129918 is about 1255.7346995167.

The spelling of 1980129918 in words is "one billion, nine hundred eighty million, one hundred twenty-nine thousand, nine hundred eighteen".