1100019990 has 32 divisors (see below), whose sum is σ = 2711403360. Its totient is φ = 285410304.

The previous prime is 1100019961. The next prime is 1100020021. The reversal of 1100019990 is 999100011.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 494395 + ... + 496614.

It is an arithmetic number, because the mean of its divisors is an integer number (84731355).

Almost surely, 2^1100019990 is an apocalyptic number.

1100019990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1100019990 is an abundant number, since it is smaller than the sum of its proper divisors (1611383370).

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

1100019990 is a wasteful number, since it uses less digits than its factorization.

1100019990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991056.

The product of its (nonzero) digits is 729, while the sum is 30.

The square root of 1100019990 is about 33166.5492627738. The cubic root of 1100019990 is about 1032.2863685335.

The spelling of 1100019990 in words is "one billion, one hundred million, nineteen thousand, nine hundred ninety".