77139 has 8 divisors (see below), whose sum is σ = 114320. Its totient is φ = 51408.
The previous prime is 77137. The next prime is 77141. The reversal of 77139 is 93177.
77139 is nontrivially palindromic in base 12.
It is an interprime number because it is at equal distance from previous prime (77137) and next prime (77141).
It is not a de Polignac number, because 77139 - 21 = 77137 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: 2857 = 77139 / (7 + 7 + 1 + 3 + 9).
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (77137) 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, 1402 + ... + 1455.
It is an arithmetic number, because the mean of its divisors is an integer number (14290).
277139 is an apocalyptic number.
77139 is a deficient number, since it is larger than the sum of its proper divisors (37181).
77139 is a wasteful number, since it uses less digits than its factorization.
77139 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2866 (or 2860 counting only the distinct ones).
The product of its digits is 1323, while the sum is 27.
The square root of 77139 is about 277.7390861942. The cubic root of 77139 is about 42.5687928556.
It can be divided in two parts, 77 and 139, that added together give a cube (216 = 63).
The spelling of 77139 in words is "seventy-seven thousand, one hundred thirty-nine".
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