990191850 has 24 divisors (see below), whose sum is σ = 2455676160. Its totient is φ = 264051120.

The previous prime is 990191849. The next prime is 990191879. The reversal of 990191850 is 58191099.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3300490 + ... + 3300789.

It is an arithmetic number, because the mean of its divisors is an integer number (102319840).

Almost surely, 2^990191850 is an apocalyptic number.

990191850 is an abundant number, since it is smaller than the sum of its proper divisors (1465484310).

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

990191850 is a wasteful number, since it uses less digits than its factorization.

990191850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6601294 (or 6601289 counting only the distinct ones).

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 990191850 is about 31467.3139940479. The cubic root of 990191850 is about 996.7198691723.

The spelling of 990191850 in words is "nine hundred ninety million, one hundred ninety-one thousand, eight hundred fifty".