804043989 has 108 divisors (see below), whose sum is σ = 1460679948. Its totient is φ = 440899200.

The previous prime is 804043979. The next prime is 804043997. The reversal of 804043989 is 989340408.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 32148900 + 771895089 = 5670^2 + 27783^2 .

It is not a de Polignac number, because 804043989 - 2¹¹ = 804041941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (804043949) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 13181019 + ... + 13181079.

Almost surely, 2^804043989 is an apocalyptic number.

804043989 is the 17934-th heptagonal number.

It is an amenable number.

804043989 is a deficient number, since it is larger than the sum of its proper divisors (656635959).

804043989 is an frugal number, since it uses more digits than its factorization.

804043989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 112 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 804043989 is about 28355.6694331134. The cubic root of 804043989 is about 929.8793495930.

The spelling of 804043989 in words is "eight hundred four million, forty-three thousand, nine hundred eighty-nine".