6908409 has 40 divisors (see below), whose sum is σ = 11369160. Its totient is φ = 4161024.

The previous prime is 6908399. The next prime is 6908411. The reversal of 6908409 is 9048096.

It can be written as a sum of positive squares in 4 ways, for example, as 3504384 + 3404025 = 1872^2 + 1845^2 .

It is not a de Polignac number, because 6908409 - 2⁴ = 6908393 is a prime.

It is a super-2 number, since 2×6908409² = 95452229822562, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (6908309) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 39847 + ... + 40019.

It is an arithmetic number, because the mean of its divisors is an integer number (284229).

Almost surely, 2^6908409 is an apocalyptic number.

It is an amenable number.

6908409 is a deficient number, since it is larger than the sum of its proper divisors (4460751).

6908409 is a wasteful number, since it uses less digits than its factorization.

6908409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 6908409 is about 2628.3852457355. The cubic root of 6908409 is about 190.4551323436.

The spelling of 6908409 in words is "six million, nine hundred eight thousand, four hundred nine".