40521540 has 48 divisors (see below), whose sum is σ = 120137472. Its totient is φ = 10169856.

The previous prime is 40521529. The next prime is 40521541. The reversal of 40521540 is 4512504.

It is not an unprimeable number, because it can be changed into a prime (40521541) 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, 18844 + ... + 20883.

It is an arithmetic number, because the mean of its divisors is an integer number (2502864).

Almost surely, 2^40521540 is an apocalyptic number.

It is an amenable number.

40521540 is an abundant number, since it is smaller than the sum of its proper divisors (79615932).

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

40521540 is a wasteful number, since it uses less digits than its factorization.

40521540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39756 (or 39754 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 40521540 is about 6365.6531479495. The cubic root of 40521540 is about 343.4751438148.

It can be divided in two parts, 405 and 21540, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 40521540 in words is "forty million, five hundred twenty-one thousand, five hundred forty".