40661500 has 48 divisors (see below), whose sum is σ = 96890976. Its totient is φ = 14784000.

The previous prime is 40661477. The next prime is 40661503. The reversal of 40661500 is 516604.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40661503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1804 + ... + 9196.

It is an arithmetic number, because the mean of its divisors is an integer number (2018562).

Almost surely, 2^40661500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40661500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48445488).

40661500 is an abundant number, since it is smaller than the sum of its proper divisors (56229476).

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

40661500 is a wasteful number, since it uses less digits than its factorization.

40661500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7423 (or 7411 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 40661500 is about 6376.6370447125. The cubic root of 40661500 is about 343.8701398247.

Subtracting from 40661500 its reverse (516604), we obtain a square (40144896 = 6336²).

The spelling of 40661500 in words is "forty million, six hundred sixty-one thousand, five hundred".