145689 has 4 divisors (see below), whose sum is σ = 194256. Its totient is φ = 97124.

The previous prime is 145687. The next prime is 145703. The reversal of 145689 is 986541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 986541 = 3 ⋅328847.

It is a cyclic number.

It is not a de Polignac number, because 145689 - 2¹ = 145687 is a prime.

It is a D-number.

145689 is a lucky number.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (145681) 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, 24279 + ... + 24284.

It is an arithmetic number, because the mean of its divisors is an integer number (48564).

2¹⁴⁵⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

145689 is a deficient number, since it is larger than the sum of its proper divisors (48567).

145689 is an equidigital number, since it uses as much as digits as its factorization.

145689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48566.

The product of its digits is 8640, while the sum is 33.

The square root of 145689 is about 381.6922844387. The cubic root of 145689 is about 52.6189592726.

The spelling of 145689 in words is "one hundred forty-five thousand, six hundred eighty-nine".