40408997 has 2 divisors, whose sum is σ = 40408998. Its totient is φ = 40408996.

The previous prime is 40408993. The next prime is 40409009. The reversal of 40408997 is 79980404.

40408997 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., 39551521 + 857476 = 6289^2 + 926^2 .

It is a cyclic number.

It is not a de Polignac number, because 40408997 - 2² = 40408993 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40408993) 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, 20204498 + 20204499.

It is an arithmetic number, because the mean of its divisors is an integer number (20204499).

Almost surely, 2^40408997 is an apocalyptic number.

It is an amenable number.

40408997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40408997 is an equidigital number, since it uses as much as digits as its factorization.

40408997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 40408997 is about 6356.8071388080. The cubic root of 40408997 is about 343.1568639944.

The spelling of 40408997 in words is "forty million, four hundred eight thousand, nine hundred ninety-seven".