999140 has 12 divisors (see below), whose sum is σ = 2098236. Its totient is φ = 399648.

The previous prime is 999133. The next prime is 999149. The reversal of 999140 is 41999.

It can be written as a sum of positive squares in 2 ways, for example, as 306916 + 692224 = 554^2 + 832^2 .

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 999097 and 999106.

It is not an unprimeable number, because it can be changed into a prime (999149) by changing a digit.

999140 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 3 ways as a sum of consecutive naturals, for example, 24959 + ... + 24998.

It is an arithmetic number, because the mean of its divisors is an integer number (174853).

2⁹⁹⁹¹⁴⁰ is an apocalyptic number.

It is an amenable number.

999140 is an abundant number, since it is smaller than the sum of its proper divisors (1099096).

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

999140 is a wasteful number, since it uses less digits than its factorization.

999140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49966 (or 49964 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 999140 is about 999.5699075102. The cubic root of 999140 is about 99.9713251116.

The spelling of 999140 in words is "nine hundred ninety-nine thousand, one hundred forty".