38711381 has 4 divisors (see below), whose sum is σ = 39094764. Its totient is φ = 38328000.

The previous prime is 38711377. The next prime is 38711411. The reversal of 38711381 is 18311783.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18311783 = 7 ⋅2615969.

It can be written as a sum of positive squares in 2 ways, for example, as 19439281 + 19272100 = 4409^2 + 4390^2 .

It is a cyclic number.

It is not a de Polignac number, because 38711381 - 2² = 38711377 is a prime.

It is a super-2 number, since 2×38711381² = 2997142037854322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38711311) 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, 191540 + ... + 191741.

It is an arithmetic number, because the mean of its divisors is an integer number (9773691).

Almost surely, 2^38711381 is an apocalyptic number.

It is an amenable number.

38711381 is a deficient number, since it is larger than the sum of its proper divisors (383383).

38711381 is a wasteful number, since it uses less digits than its factorization.

38711381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383382.

The product of its digits is 4032, while the sum is 32.

The square root of 38711381 is about 6221.8470730162. The cubic root of 38711381 is about 338.2825182459.

The spelling of 38711381 in words is "thirty-eight million, seven hundred eleven thousand, three hundred eighty-one".