145989 has 8 divisors (see below), whose sum is σ = 216320. Its totient is φ = 97308.

The previous prime is 145987. The next prime is 145991. The reversal of 145989 is 989541.

It is an interprime number because it is at equal distance from previous prime (145987) and next prime (145991).

It is not a de Polignac number, because 145989 - 2¹ = 145987 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 (145987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2677 + ... + 2730.

It is an arithmetic number, because the mean of its divisors is an integer number (27040).

2¹⁴⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

145989 is a deficient number, since it is larger than the sum of its proper divisors (70331).

145989 is an equidigital number, since it uses as much as digits as its factorization.

145989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5416 (or 5410 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 145989 is about 382.0850690619. The cubic root of 145989 is about 52.6550518281.

The spelling of 145989 in words is "one hundred forty-five thousand, nine hundred eighty-nine".