997774985 has 8 divisors (see below), whose sum is σ = 1222805376. Its totient is φ = 781236400.

The previous prime is 997774963. The next prime is 997775003. The reversal of 997774985 is 589477799.

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

It is a de Polignac number, because none of the positive numbers 2^k-997774985 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2122691 + ... + 2123160.

It is an arithmetic number, because the mean of its divisors is an integer number (152850672).

Almost surely, 2^997774985 is an apocalyptic number.

It is an amenable number.

997774985 is a deficient number, since it is larger than the sum of its proper divisors (225030391).

997774985 is a wasteful number, since it uses less digits than its factorization.

997774985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4245903.

The product of its digits is 40007520, while the sum is 65.

The square root of 997774985 is about 31587.5764344148. The cubic root of 997774985 is about 999.2577775755.

The spelling of 997774985 in words is "nine hundred ninety-seven million, seven hundred seventy-four thousand, nine hundred eighty-five".