1891001996 has 24 divisors (see below), whose sum is σ = 3565279200. Its totient is φ = 872410752.

The previous prime is 1891001977. The next prime is 1891002019. The reversal of 1891001996 is 6991001981.

It is a Smith number, since the sum of its digits (44) 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 7 ways as a sum of consecutive naturals, for example, 152585 + ... + 164511.

It is an arithmetic number, because the mean of its divisors is an integer number (148553300).

Almost surely, 2^1891001996 is an apocalyptic number.

It is an amenable number.

1891001996 is a deficient number, since it is larger than the sum of its proper divisors (1674277204).

1891001996 is a wasteful number, since it uses less digits than its factorization.

1891001996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14993 (or 14991 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 44.

The square root of 1891001996 is about 43485.6527604220. The cubic root of 1891001996 is about 1236.6040440080.

The spelling of 1891001996 in words is "one billion, eight hundred ninety-one million, one thousand, nine hundred ninety-six".