145639 has 8 divisors (see below), whose sum is σ = 166320. Its totient is φ = 126336.

The previous prime is 145637. The next prime is 145643. The reversal of 145639 is 936541.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 145639 - 2¹ = 145637 is a prime.

It is a Duffinian number.

145639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145633) 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, 109 + ... + 550.

It is an arithmetic number, because the mean of its divisors is an integer number (20790).

2¹⁴⁵⁶³⁹ is an apocalyptic number.

145639 is a deficient number, since it is larger than the sum of its proper divisors (20681).

145639 is a wasteful number, since it uses less digits than its factorization.

145639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689.

The product of its digits is 3240, while the sum is 28.

The square root of 145639 is about 381.6267810309. The cubic root of 145639 is about 52.6129390309.

It can be divided in two parts, 145 and 639, that added together give a square (784 = 28²).

The spelling of 145639 in words is "one hundred forty-five thousand, six hundred thirty-nine".