38743681 has 4 divisors (see below), whose sum is σ = 40079700. Its totient is φ = 37407664.

The previous prime is 38743669. The next prime is 38743687. The reversal of 38743681 is 18634783.

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 29257281 + 9486400 = 5409^2 + 3080^2 .

It is a cyclic number.

It is not a de Polignac number, because 38743681 - 2⁹ = 38743169 is a prime.

It is a super-2 number, since 2×38743681² = 3002145634859522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38743687) 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, 667966 + ... + 668023.

It is an arithmetic number, because the mean of its divisors is an integer number (10019925).

Almost surely, 2^38743681 is an apocalyptic number.

It is an amenable number.

38743681 is a deficient number, since it is larger than the sum of its proper divisors (1336019).

38743681 is a wasteful number, since it uses less digits than its factorization.

38743681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336018.

The product of its digits is 96768, while the sum is 40.

The square root of 38743681 is about 6224.4422240069. The cubic root of 38743681 is about 338.3765774735.

The spelling of 38743681 in words is "thirty-eight million, seven hundred forty-three thousand, six hundred eighty-one".