38691 has 8 divisors (see below), whose sum is σ = 57360. Its totient is φ = 25776.

The previous prime is 38677. The next prime is 38693. The reversal of 38691 is 19683.

38691 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 38691 - 2¹¹ = 36643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1433 = 38691 / (3 + 8 + 6 + 9 + 1).

It is not an unprimeable number, because it can be changed into a prime (38693) 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, 690 + ... + 743.

It is an arithmetic number, because the mean of its divisors is an integer number (7170).

2³⁸⁶⁹¹ is an apocalyptic number.

38691 is a deficient number, since it is larger than the sum of its proper divisors (18669).

38691 is a wasteful number, since it uses less digits than its factorization.

38691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442 (or 1436 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 38691 is about 196.7002796134. The cubic root of 38691 is about 33.8223140821.

It can be divided in two parts, 38 and 691, that added together give a 6-th power (729 = 3⁶).

The spelling of 38691 in words is "thirty-eight thousand, six hundred ninety-one".