4209681 has 8 divisors (see below), whose sum is σ = 6414784. Its totient is φ = 2405520.

The previous prime is 4209679. The next prime is 4209683. The reversal of 4209681 is 1869024.

It is an interprime number because it is at equal distance from previous prime (4209679) and next prime (4209683).

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

It is not a de Polignac number, because 4209681 - 2¹ = 4209679 is a prime.

It is a super-2 number, since 2×4209681² = 35442828243522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

4209681 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4209683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100210 + ... + 100251.

It is an arithmetic number, because the mean of its divisors is an integer number (801848).

Almost surely, 2^4209681 is an apocalyptic number.

It is an amenable number.

4209681 is a deficient number, since it is larger than the sum of its proper divisors (2205103).

4209681 is a wasteful number, since it uses less digits than its factorization.

4209681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200471.

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

The square root of 4209681 is about 2051.7507158522. The cubic root of 4209681 is about 161.4667345787.

It can be divided in two parts, 420 and 9681, that added together give a palindrome (10101).

The spelling of 4209681 in words is "four million, two hundred nine thousand, six hundred eighty-one".