Search a number
-
+
389231 is a prime number
BaseRepresentation
bin1011111000001101111
3201202220222
41133001233
544423411
612201555
73210533
oct1370157
9652828
10389231
11246487
121692bb
1310821b
14a1bc3
157a4db
hex5f06f

389231 has 2 divisors, whose sum is σ = 389232. Its totient is φ = 389230.

The previous prime is 389227. The next prime is 389269. The reversal of 389231 is 132983.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 389231 - 22 = 389227 is a prime.

It is a super-2 number, since 2×3892312 = 303001542722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 389231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (389531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 194615 + 194616.

It is an arithmetic number, because the mean of its divisors is an integer number (194616).

2389231 is an apocalyptic number.

389231 is a deficient number, since it is larger than the sum of its proper divisors (1).

389231 is an equidigital number, since it uses as much as digits as its factorization.

389231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 389231 is about 623.8838032839. The cubic root of 389231 is about 73.0133834222.

The spelling of 389231 in words is "three hundred eighty-nine thousand, two hundred thirty-one".