145685 has 4 divisors (see below), whose sum is σ = 174828. Its totient is φ = 116544.

The previous prime is 145681. The next prime is 145687. The reversal of 145685 is 586541.

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 98596 + 47089 = 314^2 + 217^2 .

It is a cyclic number.

It is not a de Polignac number, because 145685 - 2² = 145681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

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, 14564 + ... + 14573.

It is an arithmetic number, because the mean of its divisors is an integer number (43707).

2¹⁴⁵⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

145685 is a deficient number, since it is larger than the sum of its proper divisors (29143).

145685 is an equidigital number, since it uses as much as digits as its factorization.

145685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29142.

The product of its digits is 4800, while the sum is 29.

The square root of 145685 is about 381.6870445797. The cubic root of 145685 is about 52.6184777040.

The spelling of 145685 in words is "one hundred forty-five thousand, six hundred eighty-five".