2409681 has 4 divisors (see below), whose sum is σ = 3212912. Its totient is φ = 1606452.

The previous prime is 2409679. The next prime is 2409689. The reversal of 2409681 is 1869042.

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 not a de Polignac number, because 2409681 - 2¹ = 2409679 is a prime.

It is a super-2 number, since 2×2409681² = 11613125043522, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2409689) 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, 401611 + ... + 401616.

It is an arithmetic number, because the mean of its divisors is an integer number (803228).

2^2409681 is an apocalyptic number.

It is an amenable number.

2409681 is a deficient number, since it is larger than the sum of its proper divisors (803231).

2409681 is an equidigital number, since it uses as much as digits as its factorization.

2409681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803230.

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

The square root of 2409681 is about 1552.3147232440. The cubic root of 2409681 is about 134.0663701808.

The spelling of 2409681 in words is "two million, four hundred nine thousand, six hundred eighty-one".