1990851432 has 32 divisors (see below), whose sum is σ = 5098524480. Its totient is φ = 647431040.

The previous prime is 1990851397. The next prime is 1990851437. The reversal of 1990851432 is 2341580991.

It is not an unprimeable number, because it can be changed into a prime (1990851437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1010628 + ... + 1012595.

It is an arithmetic number, because the mean of its divisors is an integer number (159328890).

Almost surely, 2^1990851432 is an apocalyptic number.

1990851432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1990851432 is an abundant number, since it is smaller than the sum of its proper divisors (3107673048).

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

1990851432 is a wasteful number, since it uses less digits than its factorization.

1990851432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2023273 (or 2023269 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 1990851432 is about 44618.9582128494. The cubic root of 1990851432 is about 1257.9970343415.

The spelling of 1990851432 in words is "one billion, nine hundred ninety million, eight hundred fifty-one thousand, four hundred thirty-two".