1980129990 has 32 divisors (see below), whose sum is σ = 4753488096. Its totient is φ = 527904000.

The previous prime is 1980129959. The next prime is 1980130003. The reversal of 1980129990 is 999210891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215490 + ... + 224490.

It is an arithmetic number, because the mean of its divisors is an integer number (148546503).

Almost surely, 2^1980129990 is an apocalyptic number.

1980129990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1980129990 is an abundant number, since it is smaller than the sum of its proper divisors (2773358106).

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

1980129990 is a wasteful number, since it uses less digits than its factorization.

1980129990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16344.

The product of its (nonzero) digits is 104976, while the sum is 48.

The square root of 1980129990 is about 44498.6515526033. The cubic root of 1980129990 is about 1255.7347147368.

The spelling of 1980129990 in words is "one billion, nine hundred eighty million, one hundred twenty-nine thousand, nine hundred ninety".