999998142 has 64 divisors (see below), whose sum is σ = 2354365440. Its totient is φ = 279158400.

The previous prime is 999998141. The next prime is 999998143. The reversal of 999998142 is 241899999.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (999998141) and next prime (999998143).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999998141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 616092 + ... + 617712.

It is an arithmetic number, because the mean of its divisors is an integer number (36786960).

Almost surely, 2^999998142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999998142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1177182720).

999998142 is an abundant number, since it is smaller than the sum of its proper divisors (1354367298).

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

999998142 is a wasteful number, since it uses less digits than its factorization.

999998142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2369.

The product of its digits is 3779136, while the sum is 60.

The square root of 999998142 is about 31622.7472241107. The cubic root of 999998142 is about 999.9993806663. Note that the first 3 decimals are identical.

The spelling of 999998142 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, one hundred forty-two".