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145489 = 731993
BaseRepresentation
bin100011100001010001
321101120111
4203201101
514123424
63041321
71144111
oct434121
9241514
10145489
119a343
1270241
13512b6
143b041
152d194
hex23851

145489 has 4 divisors (see below), whose sum is σ = 147556. Its totient is φ = 143424.

The previous prime is 145487. The next prime is 145501. The reversal of 145489 is 984541.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 94864 + 50625 = 308^2 + 225^2 .

It is a cyclic number.

It is not a de Polignac number, because 145489 - 21 = 145487 is a prime.

It is a Duffinian number.

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 145489.

It is not an unprimeable number, because it can be changed into a prime (145487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 924 + ... + 1069.

It is an arithmetic number, because the mean of its divisors is an integer number (36889).

2145489 is an apocalyptic number.

It is an amenable number.

145489 is a deficient number, since it is larger than the sum of its proper divisors (2067).

145489 is an equidigital number, since it uses as much as digits as its factorization.

145489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2066.

The product of its digits is 5760, while the sum is 31.

The square root of 145489 is about 381.4302033138. The cubic root of 145489 is about 52.5948700342.

The spelling of 145489 in words is "one hundred forty-five thousand, four hundred eighty-nine".

Divisors: 1 73 1993 145489