40306249 has 2 divisors, whose sum is σ = 40306250. Its totient is φ = 40306248.

The previous prime is 40306241. The next prime is 40306261. The reversal of 40306249 is 94260304.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30603024 + 9703225 = 5532^2 + 3115^2 .

It is a cyclic number.

It is not a de Polignac number, because 40306249 - 2³ = 40306241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40306241) 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, 20153124 + 20153125.

It is an arithmetic number, because the mean of its divisors is an integer number (20153125).

Almost surely, 2^40306249 is an apocalyptic number.

It is an amenable number.

40306249 is a deficient number, since it is larger than the sum of its proper divisors (1).

40306249 is an equidigital number, since it uses as much as digits as its factorization.

40306249 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 40306249 is about 6348.7202647463. The cubic root of 40306249 is about 342.8657686901.

The spelling of 40306249 in words is "forty million, three hundred six thousand, two hundred forty-nine".