1971894444 has 48 divisors (see below), whose sum is σ = 4962117888. Its totient is φ = 605867328.

The previous prime is 1971894433. The next prime is 1971894451. The reversal of 1971894444 is 4444981791.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104719 + ... + 122105.

It is an arithmetic number, because the mean of its divisors is an integer number (103377456).

Almost surely, 2^1971894444 is an apocalyptic number.

It is an amenable number.

1971894444 is an abundant number, since it is smaller than the sum of its proper divisors (2990223444).

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

1971894444 is a wasteful number, since it uses less digits than its factorization.

1971894444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18134 (or 18132 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 51.

The square root of 1971894444 is about 44406.0181056577. The cubic root of 1971894444 is about 1253.9913895356.

The spelling of 1971894444 in words is "one billion, nine hundred seventy-one million, eight hundred ninety-four thousand, four hundred forty-four".