1990983990 has 32 divisors (see below), whose sum is σ = 4932504576. Its totient is φ = 513802080.

The previous prime is 1990983977. The next prime is 1990984001. The reversal of 1990983990 is 993890991.

It is a self number, because there is not a number n which added to its sum of digits gives 1990983990.

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, 1069492 + ... + 1071351.

It is an arithmetic number, because the mean of its divisors is an integer number (154140768).

Almost surely, 2^1990983990 is an apocalyptic number.

1990983990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1990983990 is an abundant number, since it is smaller than the sum of its proper divisors (2941520586).

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

1990983990 is a wasteful number, since it uses less digits than its factorization.

1990983990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140884.

The product of its (nonzero) digits is 1417176, while the sum is 57.

The square root of 1990983990 is about 44620.4436329358. The cubic root of 1990983990 is about 1258.0249543673.

The spelling of 1990983990 in words is "one billion, nine hundred ninety million, nine hundred eighty-three thousand, nine hundred ninety".