2400389 has 4 divisors (see below), whose sum is σ = 2456256. Its totient is φ = 2344524.

The previous prime is 2400367. The next prime is 2400407. The reversal of 2400389 is 9830042.

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 2400389 - 2²⁰ = 1351813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2400329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27869 + ... + 27954.

It is an arithmetic number, because the mean of its divisors is an integer number (614064).

2^2400389 is an apocalyptic number.

It is an amenable number.

2400389 is a deficient number, since it is larger than the sum of its proper divisors (55867).

2400389 is an equidigital number, since it uses as much as digits as its factorization.

2400389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55866.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2400389 is about 1549.3188826062. The cubic root of 2400389 is about 133.8938232206.

The spelling of 2400389 in words is "two million, four hundred thousand, three hundred eighty-nine".