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30143 = 43701
BaseRepresentation
bin111010110111111
31112100102
413112333
51431033
6351315
7153611
oct72677
945312
1030143
1120713
121553b
1310949
14adb1
158de8
hex75bf

30143 has 4 divisors (see below), whose sum is σ = 30888. Its totient is φ = 29400.

The previous prime is 30139. The next prime is 30161. The reversal of 30143 is 34103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34103 = 67509.

It is a cyclic number.

It is not a de Polignac number, because 30143 - 22 = 30139 is a prime.

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 not an unprimeable number, because it can be changed into a prime (30103) 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, 308 + ... + 393.

It is an arithmetic number, because the mean of its divisors is an integer number (7722).

230143 is an apocalyptic number.

30143 is a deficient number, since it is larger than the sum of its proper divisors (745).

30143 is an equidigital number, since it uses as much as digits as its factorization.

30143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744.

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 30143 is about 173.6173954418. The cubic root of 30143 is about 31.1216172945.

Adding to 30143 its reverse (34103), we get a palindrome (64246).

The spelling of 30143 in words is "thirty thousand, one hundred forty-three".

Divisors: 1 43 701 30143