78389 has 4 divisors (see below), whose sum is σ = 80256. Its totient is φ = 76524.

The previous prime is 78367. The next prime is 78401. The reversal of 78389 is 98387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78389 - 2¹² = 74293 is a prime.

It is a super-2 number, since 2×78389² = 12289670642, which contains 22 as substring.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

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 78389.

It is not an unprimeable number, because it can be changed into a prime (78889) 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, 869 + ... + 954.

It is an arithmetic number, because the mean of its divisors is an integer number (20064).

2⁷⁸³⁸⁹ is an apocalyptic number.

It is an amenable number.

78389 is a deficient number, since it is larger than the sum of its proper divisors (1867).

78389 is a wasteful number, since it uses less digits than its factorization.

78389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1866.

The product of its digits is 12096, while the sum is 35.

The square root of 78389 is about 279.9803564538. The cubic root of 78389 is about 42.7974974517.

The spelling of 78389 in words is "seventy-eight thousand, three hundred eighty-nine".