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30019 = 112729

30019 has 4 divisors (see below), whose sum is σ = 32760. Its totient is φ = 27280.

The previous prime is 30013. The next prime is 30029. The reversal of 30019 is 91003.

It is a happy number.

30019 is nontrivially palindromic in base 9.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91003 = 118273.

It is not a de Polignac number, because 30019 - 23 = 30011 is a prime.

It is a super-2 number, since 2×300192 = 1802280722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 29990 and 30008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30011) 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, 1354 + ... + 1375.

It is an arithmetic number, because the mean of its divisors is an integer number (8190).

230019 is an apocalyptic number.

30019 is a deficient number, since it is larger than the sum of its proper divisors (2741).

30019 is a wasteful number, since it uses less digits than its factorization.

30019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2740.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 30019 is about 173.2599203509. The cubic root of 30019 is about 31.0788833883.

Subtracting from 30019 its product of nonzero digits (27), we obtain a palindrome (29992).

The spelling of 30019 in words is "thirty thousand, nineteen".

Divisors: 1 11 2729 30019