2861409 has 8 divisors (see below), whose sum is σ = 3825792. Its totient is φ = 1902320.

The previous prime is 2861399. The next prime is 2861447. The reversal of 2861409 is 9041682.

2861409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2861409 - 2⁵ = 2861377 is a prime.

It is a super-2 number, since 2×2861409² = 16375322930562, which contains 22 as substring.

2861409 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2861479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 187 + ... + 2399.

It is an arithmetic number, because the mean of its divisors is an integer number (478224).

2^2861409 is an apocalyptic number.

It is an amenable number.

2861409 is a deficient number, since it is larger than the sum of its proper divisors (964383).

2861409 is a wasteful number, since it uses less digits than its factorization.

2861409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2647.

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

The square root of 2861409 is about 1691.5699808166. The cubic root of 2861409 is about 141.9689312442.

The spelling of 2861409 in words is "two million, eight hundred sixty-one thousand, four hundred nine".