139667 has 4 divisors (see below), whose sum is σ = 152376. Its totient is φ = 126960.

The previous prime is 139663. The next prime is 139681. The reversal of 139667 is 766931.

139667 is nontrivially palindromic in base 14 and base 15.

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 139667 - 2² = 139663 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6338 + ... + 6359.

It is an arithmetic number, because the mean of its divisors is an integer number (38094).

2¹³⁹⁶⁶⁷ is an apocalyptic number.

139667 is a deficient number, since it is larger than the sum of its proper divisors (12709).

139667 is a wasteful number, since it uses less digits than its factorization.

139667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12708.

The product of its digits is 6804, while the sum is 32.

The square root of 139667 is about 373.7204837843. The cubic root of 139667 is about 51.8837392737.

Subtracting 139667 from its reverse (766931), we obtain a square (627264 = 792²).

The spelling of 139667 in words is "one hundred thirty-nine thousand, six hundred sixty-seven".