2399868 has 42 divisors (see below), whose sum is σ = 6304424. Its totient is φ = 798984.

The previous prime is 2399821. The next prime is 2399869. The reversal of 2399868 is 8689932.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2399869) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 2505 + ... + 3327.

2^2399868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2399868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3152212).

2399868 is an abundant number, since it is smaller than the sum of its proper divisors (3904556).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2399868 is an equidigital number, since it uses as much as digits as its factorization.

2399868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845 (or 828 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 2399868 is about 1549.1507350804. The cubic root of 2399868 is about 133.8841353839.

Subtracting 2399868 from its reverse (8689932), we obtain a square (6290064 = 2508²).

The spelling of 2399868 in words is "two million, three hundred ninety-nine thousand, eight hundred sixty-eight".