7385681 has 8 divisors (see below), whose sum is σ = 7619304. Its totient is φ = 7153920.

The previous prime is 7385669. The next prime is 7385683. The reversal of 7385681 is 1865837.

It can be written as a sum of positive squares in 4 ways, for example, as 672400 + 6713281 = 820^2 + 2591^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7385681 is a prime.

It is a super-2 number, since 2×7385681² = 109096567667522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7385683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15791 + ... + 16251.

It is an arithmetic number, because the mean of its divisors is an integer number (952413).

Almost surely, 2^7385681 is an apocalyptic number.

It is an amenable number.

7385681 is a deficient number, since it is larger than the sum of its proper divisors (233623).

7385681 is a wasteful number, since it uses less digits than its factorization.

7385681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931.

The product of its digits is 40320, while the sum is 38.

The square root of 7385681 is about 2717.6609427962. The cubic root of 7385681 is about 194.7437440418.

It can be divided in two parts, 73856 and 81, that added together give a palindrome (73937).

The spelling of 7385681 in words is "seven million, three hundred eighty-five thousand, six hundred eighty-one".