997404169 has 8 divisors (see below), whose sum is σ = 1002573000. Its totient is φ = 992249472.

The previous prime is 997404157. The next prime is 997404181. The reversal of 997404169 is 961404799.

It is an interprime number because it is at equal distance from previous prime (997404157) and next prime (997404181).

It can be written as a sum of positive squares in 4 ways, for example, as 154082569 + 843321600 = 12413^2 + 29040^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 997404169 - 2²⁹ = 460533257 is a prime.

It is a super-4 number, since 4×997404169⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997404139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 155967 + ... + 162235.

It is an arithmetic number, because the mean of its divisors is an integer number (125321625).

Almost surely, 2^997404169 is an apocalyptic number.

It is an amenable number.

997404169 is a deficient number, since it is larger than the sum of its proper divisors (5168831).

997404169 is a wasteful number, since it uses less digits than its factorization.

997404169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7067.

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

The square root of 997404169 is about 31581.7062395305. The cubic root of 997404169 is about 999.1339732141.

The spelling of 997404169 in words is "nine hundred ninety-seven million, four hundred four thousand, one hundred sixty-nine".