19990112 has 24 divisors (see below), whose sum is σ = 39803400. Its totient is φ = 9881344.

The previous prime is 19990111. The next prime is 19990129. The reversal of 19990112 is 21109991.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19990111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 662 + ... + 6357.

It is an arithmetic number, because the mean of its divisors is an integer number (1658475).

Almost surely, 2^19990112 is an apocalyptic number.

It is an amenable number.

19990112 is a deficient number, since it is larger than the sum of its proper divisors (19813288).

19990112 is an equidigital number, since it uses as much as digits as its factorization.

19990112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7118 (or 7110 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 32.

The square root of 19990112 is about 4471.0303063164. The cubic root of 19990112 is about 271.3970206830.

It can be divided in two parts, 19990 and 112, that added together give a palindrome (20102).

The spelling of 19990112 in words is "nineteen million, nine hundred ninety thousand, one hundred twelve".