1997324208 has 120 divisors (see below), whose sum is σ = 6117056400. Its totient is φ = 603348480.

The previous prime is 1997324149. The next prime is 1997324257. The reversal of 1997324208 is 8024237991.

1997324208 is a `hidden beast` number, since 199 + 7 + 32 + 420 + 8 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 551010 + ... + 554622.

It is an arithmetic number, because the mean of its divisors is an integer number (50975470).

Almost surely, 2^1997324208 is an apocalyptic number.

1997324208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1997324208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3058528200).

1997324208 is an abundant number, since it is smaller than the sum of its proper divisors (4119732192).

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

1997324208 is a wasteful number, since it uses less digits than its factorization.

1997324208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3987 (or 3978 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1997324208 is about 44691.4332730558. The cubic root of 1997324208 is about 1259.3589180180.

The spelling of 1997324208 in words is "one billion, nine hundred ninety-seven million, three hundred twenty-four thousand, two hundred eight".