999843420 has 24 divisors (see below), whose sum is σ = 2799561744. Its totient is φ = 266624896.

The previous prime is 999843413. The next prime is 999843421. The reversal of 999843420 is 24348999.

It is a self number, because there is not a number n which added to its sum of digits gives 999843420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999843421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8331969 + ... + 8332088.

It is an arithmetic number, because the mean of its divisors is an integer number (116648406).

Almost surely, 2^999843420 is an apocalyptic number.

It is an amenable number.

999843420 is an abundant number, since it is smaller than the sum of its proper divisors (1799718324).

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

999843420 is a wasteful number, since it uses less digits than its factorization.

999843420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16664069 (or 16664067 counting only the distinct ones).

The product of its (nonzero) digits is 559872, while the sum is 48.

The square root of 999843420 is about 31620.3007575829. The cubic root of 999843420 is about 999.9478039423.

The spelling of 999843420 in words is "nine hundred ninety-nine million, eight hundred forty-three thousand, four hundred twenty".