77389 has 4 divisors (see below), whose sum is σ = 83356. Its totient is φ = 71424.

The previous prime is 77383. The next prime is 77417. The reversal of 77389 is 98377.

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

It can be written as a sum of positive squares in 2 ways, for example, as 4489 + 72900 = 67^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 77389 - 2⁷ = 77261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77383) 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, 2964 + ... + 2989.

It is an arithmetic number, because the mean of its divisors is an integer number (20839).

2⁷⁷³⁸⁹ is an apocalyptic number.

It is an amenable number.

77389 is a deficient number, since it is larger than the sum of its proper divisors (5967).

77389 is a wasteful number, since it uses less digits than its factorization.

77389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5966.

The product of its digits is 10584, while the sum is 34.

The square root of 77389 is about 278.1887848207. The cubic root of 77389 is about 42.6147303714.

It can be divided in two parts, 7 and 7389, that added together give a square (7396 = 86²).

The spelling of 77389 in words is "seventy-seven thousand, three hundred eighty-nine".