1999842 has 16 divisors (see below), whose sum is σ = 4307520. Its totient is φ = 615312.

The previous prime is 1999819. The next prime is 1999853. The reversal of 1999842 is 2489991.

It is a junction number, because it is equal to n+sod(n) for n = 1999794 and 1999803.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12742 + ... + 12897.

It is an arithmetic number, because the mean of its divisors is an integer number (269220).

2^1999842 is an apocalyptic number.

1999842 is an abundant number, since it is smaller than the sum of its proper divisors (2307678).

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

1999842 is a wasteful number, since it uses less digits than its factorization.

1999842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25657.

The product of its digits is 46656, while the sum is 42.

The square root of 1999842 is about 1414.1576998341. The cubic root of 1999842 is about 125.9887871100.

The spelling of 1999842 in words is "one million, nine hundred ninety-nine thousand, eight hundred forty-two".