1021965616 has 80 divisors (see below), whose sum is σ = 2407068160. Its totient is φ = 410572800.

The previous prime is 1021965599. The next prime is 1021965653. The reversal of 1021965616 is 6165691201.

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 15 ways as a sum of consecutive naturals, for example, 203941 + ... + 208891.

It is an arithmetic number, because the mean of its divisors is an integer number (30088352).

Almost surely, 2^1021965616 is an apocalyptic number.

1021965616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021965616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203534080).

1021965616 is an abundant number, since it is smaller than the sum of its proper divisors (1385102544).

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

1021965616 is a wasteful number, since it uses less digits than its factorization.

1021965616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5082 (or 5076 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 1021965616 is about 31968.1969463403. The cubic root of 1021965616 is about 1007.2689069690.

The spelling of 1021965616 in words is "one billion, twenty-one million, nine hundred sixty-five thousand, six hundred sixteen".