2399989 has 4 divisors (see below), whose sum is σ = 2477440. Its totient is φ = 2322540.

The previous prime is 2399983. The next prime is 2399993. The reversal of 2399989 is 9899932.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2399989 - 2⁹ = 2399477 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2399983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38679 + ... + 38740.

It is an arithmetic number, because the mean of its divisors is an integer number (619360).

2^2399989 is an apocalyptic number.

It is an amenable number.

2399989 is a deficient number, since it is larger than the sum of its proper divisors (77451).

2399989 is an equidigital number, since it uses as much as digits as its factorization.

2399989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77450.

The product of its digits is 314928, while the sum is 49.

The square root of 2399989 is about 1549.1897882442. The cubic root of 2399989 is about 133.8863854672.

The spelling of 2399989 in words is "two million, three hundred ninety-nine thousand, nine hundred eighty-nine".