8242409 has 16 divisors (see below), whose sum is σ = 10262400. Its totient is φ = 6459264.

The previous prime is 8242363. The next prime is 8242411. The reversal of 8242409 is 9042428.

It is a Cunningham number, because it is equal to 202³+1.

It is not a de Polignac number, because 8242409 - 2¹⁶ = 8176873 is a prime.

It is a super-2 number, since 2×8242409² = 135874612246562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8242439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2789 + ... + 4925.

It is an arithmetic number, because the mean of its divisors is an integer number (641400).

Almost surely, 2^8242409 is an apocalyptic number.

It is an amenable number.

8242409 is a deficient number, since it is larger than the sum of its proper divisors (2019991).

8242409 is a wasteful number, since it uses less digits than its factorization.

8242409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2192.

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 8242409 is about 2870.9595956753. The cubic root of 8242409 is about 202.0000081691. Note that the first 5 decimals are identical.

The spelling of 8242409 in words is "eight million, two hundred forty-two thousand, four hundred nine".