2400643 has 4 divisors (see below), whose sum is σ = 2743600. Its totient is φ = 2057688.

The previous prime is 2400623. The next prime is 2400661. The reversal of 2400643 is 3460042.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2400643 - 2²¹ = 303491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2400643.

It is not an unprimeable number, because it can be changed into a prime (2400613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171468 + ... + 171481.

It is an arithmetic number, because the mean of its divisors is an integer number (685900).

2^2400643 is an apocalyptic number.

2400643 is a deficient number, since it is larger than the sum of its proper divisors (342957).

2400643 is an equidigital number, since it uses as much as digits as its factorization.

2400643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342956.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 2400643 is about 1549.4008519425. The cubic root of 2400643 is about 133.8985457651.

Adding to 2400643 its reverse (3460042), we get a palindrome (5860685).

The spelling of 2400643 in words is "two million, four hundred thousand, six hundred forty-three".