40521493 has 4 divisors (see below), whose sum is σ = 40534240. Its totient is φ = 40508748.

The previous prime is 40521487. The next prime is 40521511. The reversal of 40521493 is 39412504.

40521493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40521493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40521413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2728 + ... + 9406.

It is an arithmetic number, because the mean of its divisors is an integer number (10133560).

Almost surely, 2^40521493 is an apocalyptic number.

It is an amenable number.

40521493 is a deficient number, since it is larger than the sum of its proper divisors (12747).

40521493 is an equidigital number, since it uses as much as digits as its factorization.

40521493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12746.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 40521493 is about 6365.6494562613. The cubic root of 40521493 is about 343.4750110184.

Adding to 40521493 its reverse (39412504), we get a palindrome (79933997).

It can be divided in two parts, 40521 and 493, that added together give a palindrome (41014).

The spelling of 40521493 in words is "forty million, five hundred twenty-one thousand, four hundred ninety-three".