1998994 has 8 divisors (see below), whose sum is σ = 3006000. Its totient is φ = 996996.

The previous prime is 1998991. The next prime is 1999007. The reversal of 1998994 is 4998991.

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

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1998991) 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, 4 + ... + 1999.

It is an arithmetic number, because the mean of its divisors is an integer number (375750).

2^1998994 is an apocalyptic number.

1998994 is a deficient number, since it is larger than the sum of its proper divisors (1007006).

1998994 is a wasteful number, since it uses less digits than its factorization.

1998994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504.

The product of its digits is 209952, while the sum is 49.

The square root of 1998994 is about 1413.8578429248. The cubic root of 1998994 is about 125.9709767703.

It can be divided in two parts, 1998 and 994, that added together give a palindrome (2992).

The spelling of 1998994 in words is "one million, nine hundred ninety-eight thousand, nine hundred ninety-four".