1980998 has 8 divisors (see below), whose sum is σ = 2999592. Its totient is φ = 981136.

The previous prime is 1980991. The next prime is 1981037. The reversal of 1980998 is 8990891.

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

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980991) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4415 + ... + 4842.

It is an arithmetic number, because the mean of its divisors is an integer number (374949).

2^1980998 is an apocalyptic number.

1980998 is a deficient number, since it is larger than the sum of its proper divisors (1018594).

1980998 is a wasteful number, since it uses less digits than its factorization.

1980998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9366.

The product of its (nonzero) digits is 46656, while the sum is 44.

The square root of 1980998 is about 1407.4793071303. The cubic root of 1980998 is about 125.5918175935.

The spelling of 1980998 in words is "one million, nine hundred eighty thousand, nine hundred ninety-eight".