40115389 has 2 divisors, whose sum is σ = 40115390. Its totient is φ = 40115388.

The previous prime is 40115371. The next prime is 40115407. The reversal of 40115389 is 98351104.

40115389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (40115371) and next prime (40115407).

It can be written as a sum of positive squares in only one way, i.e., 27984100 + 12131289 = 5290^2 + 3483^2 .

It is a cyclic number.

It is not a de Polignac number, because 40115389 - 2¹¹ = 40113341 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40115389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40118389) 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, 20057694 + 20057695.

It is an arithmetic number, because the mean of its divisors is an integer number (20057695).

Almost surely, 2^40115389 is an apocalyptic number.

It is an amenable number.

40115389 is a deficient number, since it is larger than the sum of its proper divisors (1).

40115389 is an equidigital number, since it uses as much as digits as its factorization.

40115389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 40115389 is about 6333.6710523992. The cubic root of 40115389 is about 342.3237276475.

It can be divided in two parts, 40115 and 389, that added together give a palindrome (40504).

The spelling of 40115389 in words is "forty million, one hundred fifteen thousand, three hundred eighty-nine".