145638 has 40 divisors (see below), whose sum is σ = 348480. Its totient is φ = 45360.

The previous prime is 145637. The next prime is 145643. The reversal of 145638 is 836541.

145638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between odd and even.

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 19 ways as a sum of consecutive naturals, for example, 4683 + ... + 4713.

It is an arithmetic number, because the mean of its divisors is an integer number (8712).

2¹⁴⁵⁶³⁸ is an apocalyptic number.

145638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 145638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174240).

145638 is an abundant number, since it is smaller than the sum of its proper divisors (202842).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145638 is a wasteful number, since it uses less digits than its factorization.

145638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74 (or 65 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 145638 is about 381.6254708481. The cubic root of 145638 is about 52.6128186120.

The spelling of 145638 in words is "one hundred forty-five thousand, six hundred thirty-eight".