2409861 has 4 divisors (see below), whose sum is σ = 3213152. Its totient is φ = 1606572.

The previous prime is 2409859. The next prime is 2409863. The reversal of 2409861 is 1689042.

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 an interprime number because it is at equal distance from previous prime (2409859) and next prime (2409863).

It is not a de Polignac number, because 2409861 - 2¹ = 2409859 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2409863) 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, 401641 + ... + 401646.

It is an arithmetic number, because the mean of its divisors is an integer number (803288).

2^2409861 is an apocalyptic number.

It is an amenable number.

2409861 is a deficient number, since it is larger than the sum of its proper divisors (803291).

2409861 is an equidigital number, since it uses as much as digits as its factorization.

2409861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803290.

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 2409861 is about 1552.3727000949. The cubic root of 2409861 is about 134.0697082915.

It can be divided in two parts, 240 and 9861, that added together give a palindrome (10101).

The spelling of 2409861 in words is "two million, four hundred nine thousand, eight hundred sixty-one".