4207681 has 4 divisors (see below), whose sum is σ = 4238532. Its totient is φ = 4176832.

The previous prime is 4207663. The next prime is 4207691. The reversal of 4207681 is 1867024.

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 3207681 + 1000000 = 1791^2 + 1000^2 .

It is a cyclic number.

It is not a de Polignac number, because 4207681 - 2²¹ = 2110529 is a prime.

It is a super-2 number, since 2×4207681² = 35409158795522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4207631) 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, 15220 + ... + 15493.

It is an arithmetic number, because the mean of its divisors is an integer number (1059633).

Almost surely, 2^4207681 is an apocalyptic number.

It is an amenable number.

4207681 is a deficient number, since it is larger than the sum of its proper divisors (30851).

4207681 is a wasteful number, since it uses less digits than its factorization.

4207681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30850.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 4207681 is about 2051.2632693050. The cubic root of 4207681 is about 161.4411598282.

The spelling of 4207681 in words is "four million, two hundred seven thousand, six hundred eighty-one".