40156309 has 2 divisors, whose sum is σ = 40156310. Its totient is φ = 40156308.

The previous prime is 40156307. The next prime is 40156339. The reversal of 40156309 is 90365104.

40156309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39652209 + 504100 = 6297^2 + 710^2 .

It is a cyclic number.

It is not a de Polignac number, because 40156309 - 2¹ = 40156307 is a prime.

It is a super-2 number, since 2×40156309² = 3225058305006962, which contains 22 as substring.

Together with 40156307, it forms a pair of twin primes.

It is equal to p_2442592 and since 40156309 and 2442592 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40156307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20078154 + 20078155.

It is an arithmetic number, because the mean of its divisors is an integer number (20078155).

Almost surely, 2^40156309 is an apocalyptic number.

It is an amenable number.

40156309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40156309 is an equidigital number, since it uses as much as digits as its factorization.

40156309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 40156309 is about 6336.9005830927. The cubic root of 40156309 is about 342.4400847117.

The spelling of 40156309 in words is "forty million, one hundred fifty-six thousand, three hundred nine".