43650 has 36 divisors (see below), whose sum is σ = 118482. Its totient is φ = 11520.

The previous prime is 43649. The next prime is 43651. The reversal of 43650 is 5634.

Added to its reverse (5634) it gives a square (49284 = 222²).

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (43649) and next prime (43651).

It can be written as a sum of positive squares in 3 ways, for example, as 31329 + 12321 = 177^2 + 111^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43651) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 402 + ... + 498.

2⁴³⁶⁵⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59241).

43650 is an abundant number, since it is smaller than the sum of its proper divisors (74832).

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

43650 is a wasteful number, since it uses less digits than its factorization.

43650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 43650 is about 208.9258241578. The cubic root of 43650 is about 35.2096263273.

Adding to 43650 its reverse (5634), we get a square (49284 = 222²).

The spelling of 43650 in words is "forty-three thousand, six hundred fifty".