2399643 has 12 divisors (see below), whose sum is σ = 3648840. Its totient is φ = 1515456.

The previous prime is 2399641. The next prime is 2399647. The reversal of 2399643 is 3469932.

It is a happy number.

2399643 is a `hidden beast` number, since 2 + 3 + 9 + 9 + 643 = 666.

It is not a de Polignac number, because 2399643 - 2¹ = 2399641 is a prime.

It is a zygodrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 2399598 and 2399607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2399641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6846 + ... + 7187.

It is an arithmetic number, because the mean of its divisors is an integer number (304070).

2^2399643 is an apocalyptic number.

2399643 is a deficient number, since it is larger than the sum of its proper divisors (1249197).

2399643 is a wasteful number, since it uses less digits than its factorization.

2399643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14058 (or 14055 counting only the distinct ones).

The product of its digits is 34992, while the sum is 36.

The square root of 2399643 is about 1549.0781129433. The cubic root of 2399643 is about 133.8799511438.

The spelling of 2399643 in words is "two million, three hundred ninety-nine thousand, six hundred forty-three".