40539397 has 2 divisors, whose sum is σ = 40539398. Its totient is φ = 40539396.

The previous prime is 40539379. The next prime is 40539439. The reversal of 40539397 is 79393504.

Together with previous prime (40539379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28366276 + 12173121 = 5326^2 + 3489^2 .

It is a cyclic number.

It is not a de Polignac number, because 40539397 - 2⁷ = 40539269 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40539337) 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, 20269698 + 20269699.

It is an arithmetic number, because the mean of its divisors is an integer number (20269699).

Almost surely, 2^40539397 is an apocalyptic number.

It is an amenable number.

40539397 is a deficient number, since it is larger than the sum of its proper divisors (1).

40539397 is an equidigital number, since it uses as much as digits as its factorization.

40539397 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 102060, while the sum is 40.

The square root of 40539397 is about 6367.0555989405. The cubic root of 40539397 is about 343.5255905229.

The spelling of 40539397 in words is "forty million, five hundred thirty-nine thousand, three hundred ninety-seven".