997434186 has 64 divisors (see below), whose sum is σ = 2334686976. Its totient is φ = 278208000.

The previous prime is 997434173. The next prime is 997434223. The reversal of 997434186 is 681434799.

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 31 ways as a sum of consecutive naturals, for example, 308056 + ... + 311276.

It is an arithmetic number, because the mean of its divisors is an integer number (36479484).

Almost surely, 2^997434186 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997434186, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1167343488).

997434186 is an abundant number, since it is smaller than the sum of its proper divisors (1337252790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

997434186 is a wasteful number, since it uses less digits than its factorization.

997434186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3407.

The product of its digits is 1306368, while the sum is 51.

The square root of 997434186 is about 31582.1814636038. The cubic root of 997434186 is about 999.1439961331.

The spelling of 997434186 in words is "nine hundred ninety-seven million, four hundred thirty-four thousand, one hundred eighty-six".