138667 has 4 divisors (see below), whose sum is σ = 144720. Its totient is φ = 132616.

The previous prime is 138661. The next prime is 138679. The reversal of 138667 is 766831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138667 - 2¹⁵ = 105899 is a prime.

It is a Duffinian number.

138667 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (138661) 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, 2992 + ... + 3037.

It is an arithmetic number, because the mean of its divisors is an integer number (36180).

2¹³⁸⁶⁶⁷ is an apocalyptic number.

138667 is a deficient number, since it is larger than the sum of its proper divisors (6053).

138667 is an equidigital number, since it uses as much as digits as its factorization.

138667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6052.

The product of its digits is 6048, while the sum is 31.

The square root of 138667 is about 372.3801820720. The cubic root of 138667 is about 51.7596153184.

The spelling of 138667 in words is "one hundred thirty-eight thousand, six hundred sixty-seven".