1989814 has 4 divisors (see below), whose sum is σ = 2984724. Its totient is φ = 994906.

The previous prime is 1989811. The next prime is 1989847. The reversal of 1989814 is 4189891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4189891 = 29 ⋅144479.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497452 + ... + 497455.

It is an arithmetic number, because the mean of its divisors is an integer number (746181).

2^1989814 is an apocalyptic number.

1989814 is a deficient number, since it is larger than the sum of its proper divisors (994910).

1989814 is an equidigital number, since it uses as much as digits as its factorization.

1989814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994909.

The product of its digits is 20736, while the sum is 40.

The square root of 1989814 is about 1410.6076704740. The cubic root of 1989814 is about 125.7778482433. Note that the first 3 decimals are identical.

The spelling of 1989814 in words is "one million, nine hundred eighty-nine thousand, eight hundred fourteen".