139811 has 4 divisors (see below), whose sum is σ = 159792.
Its totient is φ = 119832.
The previous prime is 139801. The next prime is 139813. The reversal of 139811 is 118931.
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 139811 - 26 = 139747 is a prime.
It is a Duffinian number.
It is a plaindrome in base 12 and base 16.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139811.
It is not an unprimeable number, because it can be changed into a prime (139813) 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, 9980 + ... + 9993.
It is an arithmetic number, because the mean of its divisors is an integer number (39948).
2139811 is an apocalyptic number.
139811 is a deficient number, since it is larger than the sum of its proper divisors (19981).
139811 is an equidigital number, since it uses as much as digits as its factorization.
139811 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 19980.
The product of its digits is 216, while the sum is 23.
The square root of 139811 is about 373.9130915066.
The cubic root of 139811 is about 51.9015642724.
The spelling of 139811 in words is "one hundred thirty-nine thousand, eight hundred eleven".