997444405 has 16 divisors (see below), whose sum is σ = 1203187968. Its totient is φ = 793800000.

The previous prime is 997444397. The next prime is 997444421. The reversal of 997444405 is 504444799.

It is not a de Polignac number, because 997444405 - 2³ = 997444397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1327780 + ... + 1328530.

It is an arithmetic number, because the mean of its divisors is an integer number (75199248).

Almost surely, 2^997444405 is an apocalyptic number.

It is an amenable number.

997444405 is a deficient number, since it is larger than the sum of its proper divisors (205743563).

997444405 is a wasteful number, since it uses less digits than its factorization.

With its successor (997444406) it forms an eRAP, since the sums of their prime factors are consecutive (1788 and 1789).

997444405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1788.

The product of its (nonzero) digits is 725760, while the sum is 46.

The square root of 997444405 is about 31582.3432474539. The cubic root of 997444405 is about 999.1474082940.

The spelling of 997444405 in words is "nine hundred ninety-seven million, four hundred forty-four thousand, four hundred five".