2489809 has 8 divisors (see below), whose sum is σ = 2855808. Its totient is φ = 2126400.

The previous prime is 2489801. The next prime is 2489813. The reversal of 2489809 is 9089842.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2489809 - 2³ = 2489801 is a prime.

It is a Duffinian number.

2489809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2489801) 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, 2364 + ... + 3250.

It is an arithmetic number, because the mean of its divisors is an integer number (356976).

2^2489809 is an apocalyptic number.

It is an amenable number.

2489809 is a deficient number, since it is larger than the sum of its proper divisors (365999).

2489809 is an equidigital number, since it uses as much as digits as its factorization.

2489809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 2489809 is about 1577.9128619794. The cubic root of 2489809 is about 135.5362121413.

Adding to 2489809 its product of nonzero digits (41472), we get a square (2531281 = 1591²).

The spelling of 2489809 in words is "two million, four hundred eighty-nine thousand, eight hundred nine".