4208409 has 16 divisors (see below), whose sum is σ = 6316800. Its totient is φ = 2768688.

The previous prime is 4208387. The next prime is 4208419. The reversal of 4208409 is 9048024.

It is a de Polignac number, because none of the positive numbers 2^k-4208409 is a prime.

It is a super-2 number, since 2×4208409² = 35421412622562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (4208419) 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, 1147 + ... + 3119.

It is an arithmetic number, because the mean of its divisors is an integer number (394800).

Almost surely, 2^4208409 is an apocalyptic number.

It is an amenable number.

4208409 is a deficient number, since it is larger than the sum of its proper divisors (2108391).

4208409 is a wasteful number, since it uses less digits than its factorization.

4208409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061 (or 2055 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 4208409 is about 2051.4407132550. The cubic root of 4208409 is about 161.4504699752.

The spelling of 4208409 in words is "four million, two hundred eight thousand, four hundred nine".