139791 has 8 divisors (see below), whose sum is σ = 197424. Its totient is φ = 87680.

The previous prime is 139787. The next prime is 139801. The reversal of 139791 is 197931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139791 - 2² = 139787 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139791.

It is not an unprimeable number, because it can be changed into a prime (139721) 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 7 ways as a sum of consecutive naturals, for example, 1320 + ... + 1421.

It is an arithmetic number, because the mean of its divisors is an integer number (24678).

2¹³⁹⁷⁹¹ is an apocalyptic number.

139791 is a deficient number, since it is larger than the sum of its proper divisors (57633).

139791 is a wasteful number, since it uses less digits than its factorization.

139791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761.

The product of its digits is 1701, while the sum is 30.

The square root of 139791 is about 373.8863463674. The cubic root of 139791 is about 51.8990893102.

The spelling of 139791 in words is "one hundred thirty-nine thousand, seven hundred ninety-one".