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345689 is a prime number
BaseRepresentation
bin1010100011001011001
3122120012022
41110121121
542030224
611224225
72636561
oct1243131
9576168
10345689
112167a3
12148075
13c1466
148dda1
156c65e
hex54659

345689 has 2 divisors, whose sum is σ = 345690. Its totient is φ = 345688.

The previous prime is 345679. The next prime is 345701. The reversal of 345689 is 986543.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 267289 + 78400 = 517^2 + 280^2 .

It is an emirp because it is prime and its reverse (986543) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 345689 - 24 = 345673 is a prime.

It is a Chen prime.

It is a d-powerful number, because it can be written as 3 + 48 + 67 + 53 + 8 + 92 .

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (345659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172844 + 172845.

It is an arithmetic number, because the mean of its divisors is an integer number (172845).

2345689 is an apocalyptic number.

It is an amenable number.

345689 is a deficient number, since it is larger than the sum of its proper divisors (1).

345689 is an equidigital number, since it uses as much as digits as its factorization.

345689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 345689 is about 587.9532294324. The cubic root of 345689 is about 70.1824492181.

It can be divided in two parts, 345 and 689, that multiplied together give a triangular number (237705 = T689).

The spelling of 345689 in words is "three hundred forty-five thousand, six hundred eighty-nine".