30398 has 4 divisors (see below), whose sum is σ = 45600. Its totient is φ = 15198.

The previous prime is 30391. The next prime is 30403. The reversal of 30398 is 89303.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30391) by changing a digit.

30398 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7598 + ... + 7601.

It is an arithmetic number, because the mean of its divisors is an integer number (11400).

2³⁰³⁹⁸ is an apocalyptic number.

30398 is a deficient number, since it is larger than the sum of its proper divisors (15202).

30398 is a wasteful number, since it uses less digits than its factorization.

30398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15201.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 30398 is about 174.3502222539. The cubic root of 30398 is about 31.2091305734.

The spelling of 30398 in words is "thirty thousand, three hundred ninety-eight".