1989964 has 6 divisors (see below), whose sum is σ = 3482444. Its totient is φ = 994980.

The previous prime is 1989961. The next prime is 1989973. The reversal of 1989964 is 4699891.

1989964 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1989961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248742 + ... + 248749.

2^1989964 is an apocalyptic number.

It is an amenable number.

1989964 is a deficient number, since it is larger than the sum of its proper divisors (1492480).

1989964 is a wasteful number, since it uses less digits than its factorization.

1989964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497495 (or 497493 counting only the distinct ones).

The product of its digits is 139968, while the sum is 46.

The square root of 1989964 is about 1410.6608380472. The cubic root of 1989964 is about 125.7810087068.

The spelling of 1989964 in words is "one million, nine hundred eighty-nine thousand, nine hundred sixty-four".