1990971200 has 42 divisors (see below), whose sum is σ = 4899037446. Its totient is φ = 796387840.

The previous prime is 1990971197. The next prime is 1990971211. The reversal of 1990971200 is 21790991.

It can be written as a sum of positive squares in 3 ways, for example, as 142659136 + 1848312064 = 11944^2 + 42992^2 .

It is a congruent 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 5 ways as a sum of consecutive naturals, for example, 620579 + ... + 623778.

Almost surely, 2^1990971200 is an apocalyptic number.

1990971200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1990971200 is an abundant number, since it is smaller than the sum of its proper divisors (2908066246).

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

1990971200 is a wasteful number, since it uses less digits than its factorization.

1990971200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244379 (or 1244364 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 38.

The square root of 1990971200 is about 44620.3003127500. The cubic root of 1990971200 is about 1258.0222605278.

The spelling of 1990971200 in words is "one billion, nine hundred ninety million, nine hundred seventy-one thousand, two hundred".