1989616 has 10 divisors (see below), whose sum is σ = 3854912. Its totient is φ = 994800.

The previous prime is 1989613. The next prime is 1989619. The reversal of 1989616 is 6169891.

It is an interprime number because it is at equal distance from previous prime (1989613) and next prime (1989619).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989613) 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, 62160 + ... + 62191.

2^1989616 is an apocalyptic number.

1989616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1989616 is a deficient number, since it is larger than the sum of its proper divisors (1865296).

1989616 is a wasteful number, since it uses less digits than its factorization.

1989616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124359 (or 124353 counting only the distinct ones).

The product of its digits is 23328, while the sum is 40.

The square root of 1989616 is about 1410.5374862087. The cubic root of 1989616 is about 125.7736761884.

The spelling of 1989616 in words is "one million, nine hundred eighty-nine thousand, six hundred sixteen".