1999984158 has 24 divisors (see below), whose sum is σ = 4473084096. Its totient is φ = 645156000.

The previous prime is 1999984153. The next prime is 1999984163. The reversal of 1999984158 is 8514899991.

It is an interprime number because it is at equal distance from previous prime (1999984153) and next prime (1999984163).

It is a junction number, because it is equal to n+sod(n) for n = 1999984095 and 1999984104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999984153) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1791543 + ... + 1792658.

It is an arithmetic number, because the mean of its divisors is an integer number (186378504).

Almost surely, 2^1999984158 is an apocalyptic number.

1999984158 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1999984158 is an abundant number, since it is smaller than the sum of its proper divisors (2473099938).

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

1999984158 is a wasteful number, since it uses less digits than its factorization.

1999984158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3584240 (or 3584237 counting only the distinct ones).

The product of its digits is 8398080, while the sum is 63.

The square root of 1999984158 is about 44721.1824307006. The cubic root of 1999984158 is about 1259.9177232745.

The spelling of 1999984158 in words is "one billion, nine hundred ninety-nine million, nine hundred eighty-four thousand, one hundred fifty-eight".