2400665 has 4 divisors (see below), whose sum is σ = 2880804. Its totient is φ = 1920528.

The previous prime is 2400661. The next prime is 2400667. The reversal of 2400665 is 5660042.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1471369 + 929296 = 1213^2 + 964^2 .

It is a cyclic number.

It is not a de Polignac number, because 2400665 - 2² = 2400661 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 2400665.

It is not an unprimeable number, because it can be changed into a prime (2400661) 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, 240062 + ... + 240071.

It is an arithmetic number, because the mean of its divisors is an integer number (720201).

2^2400665 is an apocalyptic number.

It is an amenable number.

2400665 is a deficient number, since it is larger than the sum of its proper divisors (480139).

2400665 is an equidigital number, since it uses as much as digits as its factorization.

2400665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480138.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 2400665 is about 1549.4079514447. The cubic root of 2400665 is about 133.8989547887.

The spelling of 2400665 in words is "two million, four hundred thousand, six hundred sixty-five".