40248521 has 4 divisors (see below), whose sum is σ = 40282500. Its totient is φ = 40214544.

The previous prime is 40248499. The next prime is 40248541. The reversal of 40248521 is 12584204.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 28249225 + 11999296 = 5315^2 + 3464^2 .

It is a cyclic number.

It is not a de Polignac number, because 40248521 - 2⁶ = 40248457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40248541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15146 + ... + 17603.

It is an arithmetic number, because the mean of its divisors is an integer number (10070625).

Almost surely, 2^40248521 is an apocalyptic number.

It is an amenable number.

40248521 is a deficient number, since it is larger than the sum of its proper divisors (33979).

40248521 is a wasteful number, since it uses less digits than its factorization.

40248521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33978.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 40248521 is about 6344.1722076249. The cubic root of 40248521 is about 342.7020024214.

The spelling of 40248521 in words is "forty million, two hundred forty-eight thousand, five hundred twenty-one".