4002509 has 8 divisors (see below), whose sum is σ = 4630080. Its totient is φ = 3389388.

The previous prime is 4002499. The next prime is 4002527. The reversal of 4002509 is 9052004.

It is not a de Polignac number, because 4002509 - 2¹² = 3998413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4002109) 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, 48182 + ... + 48264.

It is an arithmetic number, because the mean of its divisors is an integer number (578760).

Almost surely, 2^4002509 is an apocalyptic number.

It is an amenable number.

4002509 is a deficient number, since it is larger than the sum of its proper divisors (627571).

4002509 is an frugal number, since it uses more digits than its factorization.

4002509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 4002509 is about 2000.6271516702. The cubic root of 4002509 is about 158.7732881701.

The spelling of 4002509 in words is "four million, two thousand, five hundred nine".