145999 has 4 divisors (see below), whose sum is σ = 166864. Its totient is φ = 125136.

The previous prime is 145991. The next prime is 146009. The reversal of 145999 is 999541.

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

It is a cyclic number.

It is not a de Polignac number, because 145999 - 2³ = 145991 is a prime.

It is a Duffinian number.

145999 is a modest number, since divided by 999 gives 145 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145991) 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, 10422 + ... + 10435.

It is an arithmetic number, because the mean of its divisors is an integer number (41716).

2¹⁴⁵⁹⁹⁹ is an apocalyptic number.

145999 is a deficient number, since it is larger than the sum of its proper divisors (20865).

145999 is an equidigital number, since it uses as much as digits as its factorization.

145999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20864.

The product of its digits is 14580, while the sum is 37.

The square root of 145999 is about 382.0981549288. The cubic root of 145999 is about 52.6562540614.

It can be divided in two parts, 1459 and 99, that multiplied together give a palindrome (144441).

The spelling of 145999 in words is "one hundred forty-five thousand, nine hundred ninety-nine".