997785599 has 4 divisors (see below), whose sum is σ = 997869264. Its totient is φ = 997701936.

The previous prime is 997785583. The next prime is 997785619. The reversal of 997785599 is 995587799.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 997785599 - 2⁴ = 997785583 is a prime.

It is a super-2 number, since 2×997785599² = 1991152203143577602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997787599) 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, 20222 + ... + 49035.

It is an arithmetic number, because the mean of its divisors is an integer number (249467316).

Almost surely, 2^997785599 is an apocalyptic number.

997785599 is a deficient number, since it is larger than the sum of its proper divisors (83665).

997785599 is a wasteful number, since it uses less digits than its factorization.

997785599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83664.

The product of its digits is 64297800, while the sum is 68.

The square root of 997785599 is about 31587.7444430589. The cubic root of 997785599 is about 999.2613208208.

The spelling of 997785599 in words is "nine hundred ninety-seven million, seven hundred eighty-five thousand, five hundred ninety-nine".