40389997 has 2 divisors, whose sum is σ = 40389998. Its totient is φ = 40389996.

The previous prime is 40389989. The next prime is 40390003. The reversal of 40389997 is 79998304.

40389997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30536676 + 9853321 = 5526^2 + 3139^2 .

It is a cyclic number.

It is not a de Polignac number, because 40389997 - 2³ = 40389989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40389997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40389917) 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, 20194998 + 20194999.

It is an arithmetic number, because the mean of its divisors is an integer number (20194999).

Almost surely, 2^40389997 is an apocalyptic number.

It is an amenable number.

40389997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40389997 is an equidigital number, since it uses as much as digits as its factorization.

40389997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 40389997 is about 6355.3125021513. The cubic root of 40389997 is about 343.1030723222.

The spelling of 40389997 in words is "forty million, three hundred eighty-nine thousand, nine hundred ninety-seven".