1997192900 has 36 divisors (see below), whose sum is σ = 4336761492. Its totient is φ = 798351360.

The previous prime is 1997192863. The next prime is 1997192927. The reversal of 1997192900 is 92917991.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 200958976 + 1796233924 = 14176^2 + 42382^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

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 11 ways as a sum of consecutive naturals, for example, 169604 + ... + 180996.

It is an arithmetic number, because the mean of its divisors is an integer number (120465597).

Almost surely, 2^1997192900 is an apocalyptic number.

1997192900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1997192900 is an abundant number, since it is smaller than the sum of its proper divisors (2339568592).

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

1997192900 is a wasteful number, since it uses less digits than its factorization.

1997192900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13160 (or 13153 counting only the distinct ones).

The product of its (nonzero) digits is 91854, while the sum is 47.

The square root of 1997192900 is about 44689.9641977928. The cubic root of 1997192900 is about 1259.3313198404.

The spelling of 1997192900 in words is "one billion, nine hundred ninety-seven million, one hundred ninety-two thousand, nine hundred".