4009042489 has 3 divisors (see below), whose sum is σ = 4009105807. Its totient is φ = 4008979172.

The previous prime is 4009042451. The next prime is 4009042517. The reversal of 4009042489 is 9842409004.

The square root of 4009042489 is 63317.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 252333225 + 3756709264 = 15885^2 + 61292^2 .

It is not a de Polignac number, because 4009042489 - 2⁹ = 4009041977 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4009042409) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 31659 + ... + 94975.

Almost surely, 2^4009042489 is an apocalyptic number.

4009042489 is the 63317-th square number.

4009042489 is the 31659-th centered octagonal number.

It is an amenable number.

4009042489 is a deficient number, since it is larger than the sum of its proper divisors (63318).

4009042489 is an frugal number, since it uses more digits than its factorization.

4009042489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126634 (or 63317 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The cubic root of 4009042489 is about 1588.5963231139.

Multiplying 4009042489 by its product of nonzero digits (82944), we get a square (332526020207616 = 18235296²).

The spelling of 4009042489 in words is "four billion, nine million, forty-two thousand, four hundred eighty-nine".