1980855990 has 48 divisors (see below), whose sum is σ = 5153803200. Its totient is φ = 527861376.

The previous prime is 1980855967. The next prime is 1980856043. The reversal of 1980855990 is 995580891.

1980855990 is a `hidden beast` number, since 1 + 9 + 80 + 8 + 559 + 9 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 137971 + ... + 151649.

It is an arithmetic number, because the mean of its divisors is an integer number (107370900).

Almost surely, 2^1980855990 is an apocalyptic number.

1980855990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1980855990 is an abundant number, since it is smaller than the sum of its proper divisors (3172947210).

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

1980855990 is a wasteful number, since it uses less digits than its factorization.

1980855990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15301 (or 15298 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 54.

The square root of 1980855990 is about 44506.8083555763. The cubic root of 1980855990 is about 1255.8881645964. Note that the first 3 decimals are identical.

The spelling of 1980855990 in words is "one billion, nine hundred eighty million, eight hundred fifty-five thousand, nine hundred ninety".