38135681 has 4 divisors (see below), whose sum is σ = 38513364. Its totient is φ = 37758000.

The previous prime is 38135677. The next prime is 38135683. The reversal of 38135681 is 18653183.

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 15335056 + 22800625 = 3916^2 + 4775^2 .

It is a cyclic number.

It is not a de Polignac number, because 38135681 - 2² = 38135677 is a prime.

It is a super-2 number, since 2×38135681² = 2908660330667522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (38135683) 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, 188690 + ... + 188891.

It is an arithmetic number, because the mean of its divisors is an integer number (9628341).

Almost surely, 2^38135681 is an apocalyptic number.

It is an amenable number.

38135681 is a deficient number, since it is larger than the sum of its proper divisors (377683).

38135681 is a wasteful number, since it uses less digits than its factorization.

38135681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377682.

The product of its digits is 17280, while the sum is 35.

The square root of 38135681 is about 6175.4093791424. The cubic root of 38135681 is about 336.5972023901.

The spelling of 38135681 in words is "thirty-eight million, one hundred thirty-five thousand, six hundred eighty-one".