999190120 has 16 divisors (see below), whose sum is σ = 2248177860. Its totient is φ = 399676032.

The previous prime is 999190111. The next prime is 999190121. The reversal of 999190120 is 21091999.

It can be written as a sum of positive squares in 2 ways, for example, as 967583236 + 31606884 = 31106^2 + 5622^2 .

It is a super-2 number, since 2×999190120² = 1996761791811228800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 24979753 = 999190120 / (9 + 9 + 9 + 1 + 9 + 0 + 1 + 2 + 0).

It is not an unprimeable number, because it can be changed into a prime (999190121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12489837 + ... + 12489916.

Almost surely, 2^999190120 is an apocalyptic number.

It is an amenable number.

999190120 is an abundant number, since it is smaller than the sum of its proper divisors (1248987740).

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

999190120 is a wasteful number, since it uses less digits than its factorization.

999190120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24979764 (or 24979760 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 40.

The square root of 999190120 is about 31609.9686807817. The cubic root of 999190120 is about 999.7299670888.

It can be divided in two parts, 9991901 and 20, that added together give a square (9991921 = 3161²).

The spelling of 999190120 in words is "nine hundred ninety-nine million, one hundred ninety thousand, one hundred twenty".