1999798 has 8 divisors (see below), whose sum is σ = 3010392. Its totient is φ = 996336.

The previous prime is 1999771. The next prime is 1999799. The reversal of 1999798 is 8979991.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1015 + ... + 2242.

It is an arithmetic number, because the mean of its divisors is an integer number (376299).

2^1999798 is an apocalyptic number.

1999798 is a deficient number, since it is larger than the sum of its proper divisors (1010594).

1999798 is a wasteful number, since it uses less digits than its factorization.

1999798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3566.

The product of its digits is 367416, while the sum is 52.

The square root of 1999798 is about 1414.1421427848. The cubic root of 1999798 is about 125.9878631125.

The spelling of 1999798 in words is "one million, nine hundred ninety-nine thousand, seven hundred ninety-eight".