4205681 has 4 divisors (see below), whose sum is σ = 4453092. Its totient is φ = 3958272.

The previous prime is 4205671. The next prime is 4205687. The reversal of 4205681 is 1865024.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3591025 + 614656 = 1895^2 + 784^2 .

It is a cyclic number.

It is not a de Polignac number, because 4205681 - 2¹⁰ = 4204657 is a prime.

It is a super-2 number, since 2×4205681² = 35375505347522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4205681.

It is not an unprimeable number, because it can be changed into a prime (4205687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123680 + ... + 123713.

It is an arithmetic number, because the mean of its divisors is an integer number (1113273).

Almost surely, 2^4205681 is an apocalyptic number.

It is an amenable number.

4205681 is a deficient number, since it is larger than the sum of its proper divisors (247411).

4205681 is a wasteful number, since it uses less digits than its factorization.

4205681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247410.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 4205681 is about 2050.7757068973. The cubic root of 4205681 is about 161.4155769722.

It can be divided in two parts, 420 and 5681, that multiplied together give a triangular number (2386020 = T₂₁₈₄).

The spelling of 4205681 in words is "four million, two hundred five thousand, six hundred eighty-one".