1989158 has 4 divisors (see below), whose sum is σ = 2983740. Its totient is φ = 994578.

The previous prime is 1989151. The next prime is 1989161. The reversal of 1989158 is 8519891.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989151) 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 as a sum of consecutive naturals, namely, 497288 + ... + 497291.

It is an arithmetic number, because the mean of its divisors is an integer number (745935).

2^1989158 is an apocalyptic number.

1989158 is a deficient number, since it is larger than the sum of its proper divisors (994582).

1989158 is an equidigital number, since it uses as much as digits as its factorization.

1989158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994581.

The product of its digits is 25920, while the sum is 41.

The square root of 1989158 is about 1410.3751274041. The cubic root of 1989158 is about 125.7640246167.

The spelling of 1989158 in words is "one million, nine hundred eighty-nine thousand, one hundred fifty-eight".