1990047872 has 24 divisors (see below), whose sum is σ = 3965554215. Its totient is φ = 994771584.

The previous prime is 1990047847. The next prime is 1990047893. The reversal of 1990047872 is 2787400991.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 995023936 + 995023936 = 31544^2 + 31544^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=31544.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 502733 + ... + 506675.

Almost surely, 2^1990047872 is an apocalyptic number.

It is an amenable number.

1990047872 is a deficient number, since it is larger than the sum of its proper divisors (1975506343).

1990047872 is an frugal number, since it uses more digits than its factorization.

1990047872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7900 (or 3945 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 47.

The square root of 1990047872 is about 44609.9526114969. The cubic root of 1990047872 is about 1257.8277580013.

The spelling of 1990047872 in words is "one billion, nine hundred ninety million, forty-seven thousand, eight hundred seventy-two".