997438205 has 4 divisors (see below), whose sum is σ = 1196925852. Its totient is φ = 797950560.

The previous prime is 997438159. The next prime is 997438207. The reversal of 997438205 is 502834799.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 192127321 + 805310884 = 13861^2 + 28378^2 .

It is a de Polignac number, because none of the positive numbers 2^k-997438205 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 997438205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997438207) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99743816 + ... + 99743825.

It is an arithmetic number, because the mean of its divisors is an integer number (299231463).

Almost surely, 2^997438205 is an apocalyptic number.

It is an amenable number.

997438205 is a deficient number, since it is larger than the sum of its proper divisors (199487647).

997438205 is a wasteful number, since it uses less digits than its factorization.

997438205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199487646.

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 997438205 is about 31582.2450911901. The cubic root of 997438205 is about 999.1453380945.

The spelling of 997438205 in words is "nine hundred ninety-seven million, four hundred thirty-eight thousand, two hundred five".