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30919 = 72631
BaseRepresentation
bin111100011000111
31120102011
413203013
51442134
6355051
7156100
oct74307
946364
1030919
1121259
1215a87
13110c5
14b3a7
159264
hex78c7

30919 has 6 divisors (see below), whose sum is σ = 36024. Its totient is φ = 26460.

The previous prime is 30911. The next prime is 30931. The reversal of 30919 is 91903.

It can be divided in two parts, 30 and 919, that added together give a palindrome (949).

30919 is nontrivially palindromic in base 9.

It is not a de Polignac number, because 30919 - 23 = 30911 is a prime.

It is a super-2 number, since 2×309192 = 1911969122, which contains 22 as substring.

It is a Duffinian number.

30919 is a lucky number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 30919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 267 + ... + 364.

It is an arithmetic number, because the mean of its divisors is an integer number (6004).

230919 is an apocalyptic number.

30919 is a deficient number, since it is larger than the sum of its proper divisors (5105).

30919 is an equidigital number, since it uses as much as digits as its factorization.

30919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 22.

The square root of 30919 is about 175.8379936191. The cubic root of 30919 is about 31.3864222471.

The spelling of 30919 in words is "thirty thousand, nine hundred nineteen".

Divisors: 1 7 49 631 4417 30919