40521 has 8 divisors (see below), whose sum is σ = 58240. Its totient is φ = 24912.

The previous prime is 40519. The next prime is 40529. The reversal of 40521 is 12504.

40521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 40521 - 2¹ = 40519 is a prime.

It is a Curzon number.

40521 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 40497 and 40506.

It is not an unprimeable number, because it can be changed into a prime (40529) 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, 481 + ... + 558.

It is an arithmetic number, because the mean of its divisors is an integer number (7280).

2⁴⁰⁵²¹ is an apocalyptic number.

It is an amenable number.

40521 is a deficient number, since it is larger than the sum of its proper divisors (17719).

40521 is a wasteful number, since it uses less digits than its factorization.

40521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1055.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 40521 is about 201.2982861328. The cubic root of 40521 is about 34.3473618063.

It can be divided in two parts, 40 and 521, that added together give a triangular number (561 = T₃₃).

The spelling of 40521 in words is "forty thousand, five hundred twenty-one".