145939 has 4 divisors (see below), whose sum is σ = 153640. Its totient is φ = 138240.

The previous prime is 145933. The next prime is 145949. The reversal of 145939 is 939541.

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 145939 - 2³ = 145931 is a prime.

It is a d-powerful number, because it can be written as 1 + 4⁸ + 9 + 5⁷ + 3⁷ + 9² .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 145939.

It is not an unprimeable number, because it can be changed into a prime (145931) 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, 3822 + ... + 3859.

It is an arithmetic number, because the mean of its divisors is an integer number (38410).

2¹⁴⁵⁹³⁹ is an apocalyptic number.

145939 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

145939 is a deficient number, since it is larger than the sum of its proper divisors (7701).

145939 is an equidigital number, since it uses as much as digits as its factorization.

145939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7700.

The product of its digits is 4860, while the sum is 31.

The square root of 145939 is about 382.0196330033. The cubic root of 145939 is about 52.6490398382.

The spelling of 145939 in words is "one hundred forty-five thousand, nine hundred thirty-nine".