1990447550 has 96 divisors (see below), whose sum is σ = 4824816192. Its totient is φ = 592865280.

The previous prime is 1990447519. The next prime is 1990447559. The reversal of 1990447550 is 557440991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990447559) 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 47 ways as a sum of consecutive naturals, for example, 64484 + ... + 90216.

It is an arithmetic number, because the mean of its divisors is an integer number (50258502).

Almost surely, 2^1990447550 is an apocalyptic number.

1990447550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1990447550 is an abundant number, since it is smaller than the sum of its proper divisors (2834368642).

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

1990447550 is a wasteful number, since it uses less digits than its factorization.

1990447550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25782 (or 25777 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 44.

The square root of 1990447550 is about 44614.4320820068. The cubic root of 1990447550 is about 1257.9119590630.

The spelling of 1990447550 in words is "one billion, nine hundred ninety million, four hundred forty-seven thousand, five hundred fifty".