41721540 has 144 divisors (see below), whose sum is σ = 142031232. Its totient is φ = 9106944.

The previous prime is 41721523. The next prime is 41721541. The reversal of 41721540 is 4512714.

41721540 = 60² + 61² + ... + 500².

It is a self number, because there is not a number n which added to its sum of digits gives 41721540.

It is not an unprimeable number, because it can be changed into a prime (41721541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67312 + ... + 67928.

It is an arithmetic number, because the mean of its divisors is an integer number (986328).

Almost surely, 2^41721540 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 41721540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71015616).

41721540 is an abundant number, since it is smaller than the sum of its proper divisors (100309692).

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

41721540 is a wasteful number, since it uses less digits than its factorization.

41721540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 41721540 is about 6459.2213152980. The cubic root of 41721540 is about 346.8327585929.

The spelling of 41721540 in words is "forty-one million, seven hundred twenty-one thousand, five hundred forty".