7538681 has 4 divisors (see below), whose sum is σ = 7552500. Its totient is φ = 7524864.

The previous prime is 7538651. The next prime is 7538683. The reversal of 7538681 is 1868357.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1868357 = 373 ⋅5009.

It can be written as a sum of positive squares in 2 ways, for example, as 1585081 + 5953600 = 1259^2 + 2440^2 .

It is a cyclic number.

It is not a de Polignac number, because 7538681 - 2⁶ = 7538617 is a prime.

It is a super-2 number, since 2×7538681² = 113663422439522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7538683) 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, 6056 + ... + 7193.

It is an arithmetic number, because the mean of its divisors is an integer number (1888125).

Almost surely, 2^7538681 is an apocalyptic number.

It is an amenable number.

7538681 is a deficient number, since it is larger than the sum of its proper divisors (13819).

7538681 is a wasteful number, since it uses less digits than its factorization.

7538681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13818.

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

The square root of 7538681 is about 2745.6658573104. The cubic root of 7538681 is about 196.0793185144.

The spelling of 7538681 in words is "seven million, five hundred thirty-eight thousand, six hundred eighty-one".