8406909 has 20 divisors (see below), whose sum is σ = 14353504. Its totient is φ = 4803624.

The previous prime is 8406901. The next prime is 8406917. The reversal of 8406909 is 9096048.

It is an interprime number because it is at equal distance from previous prime (8406901) and next prime (8406917).

It is not a de Polignac number, because 8406909 - 2³ = 8406901 is a prime.

It is a super-2 number, since 2×8406909² = 141352237868562, which contains 22 as substring.

It is a Duffinian number.

8406909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8406901) 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 19 ways as a sum of consecutive naturals, for example, 6847 + ... + 7980.

Almost surely, 2^8406909 is an apocalyptic number.

It is an amenable number.

8406909 is a deficient number, since it is larger than the sum of its proper divisors (5946595).

8406909 is a wasteful number, since it uses less digits than its factorization.

8406909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14846 (or 14837 counting only the distinct ones).

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

The square root of 8406909 is about 2899.4670199883. The cubic root of 8406909 is about 203.3349884902.

The spelling of 8406909 in words is "eight million, four hundred six thousand, nine hundred nine".