997838465 has 16 divisors (see below), whose sum is σ = 1293369168. Its totient is φ = 734662656.

The previous prime is 997838461. The next prime is 997838483. The reversal of 997838465 is 564838799.

997838465 = 22336² + 22337².

It can be written as a sum of positive squares in 8 ways, for example, as 56085121 + 941753344 = 7489^2 + 30688^2 .

It is not a de Polignac number, because 997838465 - 2² = 997838461 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (997838461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 872 + ... + 44681.

It is an arithmetic number, because the mean of its divisors is an integer number (80835573).

Almost surely, 2^997838465 is an apocalyptic number.

997838465 is the 22337-th centered square number.

It is an amenable number.

997838465 is a deficient number, since it is larger than the sum of its proper divisors (295530703).

997838465 is a wasteful number, since it uses less digits than its factorization.

997838465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45908.

The product of its digits is 13063680, while the sum is 59.

The square root of 997838465 is about 31588.5812438609. The cubic root of 997838465 is about 999.2789685720.

The spelling of 997838465 in words is "nine hundred ninety-seven million, eight hundred thirty-eight thousand, four hundred sixty-five".