28394 has 4 divisors (see below), whose sum is σ = 42594. Its totient is φ = 14196.

The previous prime is 28393. The next prime is 28403. The reversal of 28394 is 49382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49382 = 2 ⋅24691.

It can be written as a sum of positive squares in only one way, i.e., 15625 + 12769 = 125^2 + 113^2 .

It is not an unprimeable number, because it can be changed into a prime (28393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7097 + ... + 7100.

2²⁸³⁹⁴ is an apocalyptic number.

28394 is a deficient number, since it is larger than the sum of its proper divisors (14200).

28394 is a wasteful number, since it uses less digits than its factorization.

28394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14199.

The product of its digits is 1728, while the sum is 26.

The square root of 28394 is about 168.5051927983. The cubic root of 28394 is about 30.5076573088.

The spelling of 28394 in words is "twenty-eight thousand, three hundred ninety-four".