Search a number
-
+
72143 = 193797
BaseRepresentation
bin10001100111001111
310122221222
4101213033
54302033
61313555
7420221
oct214717
9118858
1072143
114a225
12358bb
1326ab6
141c411
1516598
hex119cf

72143 has 4 divisors (see below), whose sum is σ = 75960. Its totient is φ = 68328.

The previous prime is 72139. The next prime is 72161. The reversal of 72143 is 34127.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 72143 - 22 = 72139 is a prime.

It is a super-2 number, since 2×721432 = 10409224898, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a plaindrome in base 12 and base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72103) 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, 1880 + ... + 1917.

It is an arithmetic number, because the mean of its divisors is an integer number (18990).

272143 is an apocalyptic number.

72143 is a deficient number, since it is larger than the sum of its proper divisors (3817).

72143 is a wasteful number, since it uses less digits than its factorization.

72143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816.

The product of its digits is 168, while the sum is 17.

The square root of 72143 is about 268.5944898914. The cubic root of 72143 is about 41.6292000980.

It can be divided in two parts, 72 and 143, that multiplied together give a triangular number (10296 = T143).

The spelling of 72143 in words is "seventy-two thousand, one hundred forty-three", and thus it is an iban number.

Divisors: 1 19 3797 72143