40120309 has 2 divisors, whose sum is σ = 40120310. Its totient is φ = 40120308.

The previous prime is 40120273. The next prime is 40120319. The reversal of 40120309 is 90302104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20566225 + 19554084 = 4535^2 + 4422^2 .

It is a cyclic number.

It is not a de Polignac number, because 40120309 - 2¹¹ = 40118261 is a prime.

It is equal to p_2440531 and since 40120309 and 2440531 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 (40120319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20060154 + 20060155.

It is an arithmetic number, because the mean of its divisors is an integer number (20060155).

Almost surely, 2^40120309 is an apocalyptic number.

It is an amenable number.

40120309 is a deficient number, since it is larger than the sum of its proper divisors (1).

40120309 is an equidigital number, since it uses as much as digits as its factorization.

40120309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 40120309 is about 6334.0594408326. The cubic root of 40120309 is about 342.3377219768.

The spelling of 40120309 in words is "forty million, one hundred twenty thousand, three hundred nine".