40247509 has 2 divisors, whose sum is σ = 40247510. Its totient is φ = 40247508.

The previous prime is 40247479. The next prime is 40247513. The reversal of 40247509 is 90574204.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29866225 + 10381284 = 5465^2 + 3222^2 .

It is a cyclic number.

It is not a de Polignac number, because 40247509 - 2⁵ = 40247477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40242509) 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 as a sum of consecutive naturals, namely, 20123754 + 20123755.

It is an arithmetic number, because the mean of its divisors is an integer number (20123755).

Almost surely, 2^40247509 is an apocalyptic number.

It is an amenable number.

40247509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40247509 is an equidigital number, since it uses as much as digits as its factorization.

40247509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 40247509 is about 6344.0924488850. The cubic root of 40247509 is about 342.6991301226.

The spelling of 40247509 in words is "forty million, two hundred forty-seven thousand, five hundred nine".