1989478 has 8 divisors (see below), whose sum is σ = 3010968. Its totient is φ = 985824.

The previous prime is 1989419. The next prime is 1989479. The reversal of 1989478 is 8749891.

It is a happy number.

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 (1989479) 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 in 3 ways as a sum of consecutive naturals, for example, 4176 + ... + 4627.

It is an arithmetic number, because the mean of its divisors is an integer number (376371).

2^1989478 is an apocalyptic number.

1989478 is a deficient number, since it is larger than the sum of its proper divisors (1021490).

1989478 is a wasteful number, since it uses less digits than its factorization.

1989478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8918.

The product of its digits is 145152, while the sum is 46.

The square root of 1989478 is about 1410.4885678374. The cubic root of 1989478 is about 125.7707682288.

The spelling of 1989478 in words is "one million, nine hundred eighty-nine thousand, four hundred seventy-eight".