1921006444 has 24 divisors (see below), whose sum is σ = 3879319808. Its totient is φ = 815294160.

The previous prime is 1921006433. The next prime is 1921006523. The reversal of 1921006444 is 4446001291.

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, 330162 + ... + 335929.

Almost surely, 2^1921006444 is an apocalyptic number.

1921006444 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1921006444 is an abundant number, since it is smaller than the sum of its proper divisors (1958313364).

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

1921006444 is a wasteful number, since it uses less digits than its factorization.

1921006444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666205 (or 666203 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1921006444 is about 43829.2875141725. The cubic root of 1921006444 is about 1243.1101349681.

The spelling of 1921006444 in words is "one billion, nine hundred twenty-one million, six thousand, four hundred forty-four".