40389389 has 2 divisors, whose sum is σ = 40389390. Its totient is φ = 40389388.

The previous prime is 40389361. The next prime is 40389407. The reversal of 40389389 is 98398304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40386025 + 3364 = 6355^2 + 58^2 .

It is a cyclic number.

It is not a de Polignac number, because 40389389 - 2⁸ = 40389133 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40389319) 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, 20194694 + 20194695.

It is an arithmetic number, because the mean of its divisors is an integer number (20194695).

Almost surely, 2^40389389 is an apocalyptic number.

It is an amenable number.

40389389 is a deficient number, since it is larger than the sum of its proper divisors (1).

40389389 is an equidigital number, since it uses as much as digits as its factorization.

40389389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 40389389 is about 6355.2646679741. The cubic root of 40389389 is about 343.1013507102.

The spelling of 40389389 in words is "forty million, three hundred eighty-nine thousand, three hundred eighty-nine".