40253509 has 2 divisors, whose sum is σ = 40253510. Its totient is φ = 40253508.

The previous prime is 40253503. The next prime is 40253561. The reversal of 40253509 is 90535204.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26040609 + 14212900 = 5103^2 + 3770^2 .

It is a cyclic number.

It is not a de Polignac number, because 40253509 - 2¹⁷ = 40122437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40253503) 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, 20126754 + 20126755.

It is an arithmetic number, because the mean of its divisors is an integer number (20126755).

Almost surely, 2^40253509 is an apocalyptic number.

It is an amenable number.

40253509 is a deficient number, since it is larger than the sum of its proper divisors (1).

40253509 is an equidigital number, since it uses as much as digits as its factorization.

40253509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 40253509 is about 6344.5653121392. The cubic root of 40253509 is about 342.7161588586.

The spelling of 40253509 in words is "forty million, two hundred fifty-three thousand, five hundred nine".