1921890982 has 16 divisors (see below), whose sum is σ = 3204252432. Its totient is φ = 857103520.

The previous prime is 1921890941. The next prime is 1921890991. The reversal of 1921890982 is 2890981291.

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 7 ways as a sum of consecutive naturals, for example, 822973 + ... + 825304.

It is an arithmetic number, because the mean of its divisors is an integer number (200265777).

Almost surely, 2^1921890982 is an apocalyptic number.

1921890982 is a deficient number, since it is larger than the sum of its proper divisors (1282361450).

1921890982 is a wasteful number, since it uses less digits than its factorization.

1921890982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648343.

The product of its (nonzero) digits is 186624, while the sum is 49.

The square root of 1921890982 is about 43839.3770713043. The cubic root of 1921890982 is about 1243.3009046608.

The spelling of 1921890982 in words is "one billion, nine hundred twenty-one million, eight hundred ninety thousand, nine hundred eighty-two".