1989456 has 80 divisors (see below), whose sum is σ = 6094848. Its totient is φ = 547200.

The previous prime is 1989419. The next prime is 1989479. The reversal of 1989456 is 6549891.

It is a Harshad number since it is a multiple of its sum of digits (42).

Its product of digits (77760) is a multiple of the sum of its prime factors (240).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 10321 + ... + 10511.

2^1989456 is an apocalyptic number.

1989456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3047424).

1989456 is an abundant number, since it is smaller than the sum of its proper divisors (4105392).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1989456 is a wasteful number, since it uses less digits than its factorization.

1989456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 234 counting only the distinct ones).

The product of its digits is 77760, while the sum is 42.

The square root of 1989456 is about 1410.4807690997. The cubic root of 1989456 is about 125.7703046286.

The spelling of 1989456 in words is "one million, nine hundred eighty-nine thousand, four hundred fifty-six".