1989764 has 24 divisors (see below), whose sum is σ = 4011840. Its totient is φ = 845856.

The previous prime is 1989721. The next prime is 1989769. The reversal of 1989764 is 4679891.

It is a super-3 number, since 3×1989764³ = 23633386745075927232, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1989769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4814 + ... + 5210.

It is an arithmetic number, because the mean of its divisors is an integer number (167160).

2^1989764 is an apocalyptic number.

1989764 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1989764 is an abundant number, since it is smaller than the sum of its proper divisors (2022076).

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

1989764 is a wasteful number, since it uses less digits than its factorization.

1989764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587 (or 585 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 1989764 is about 1410.5899475042. The cubic root of 1989764 is about 125.7767947202.

The spelling of 1989764 in words is "one million, nine hundred eighty-nine thousand, seven hundred sixty-four".