1021965680 has 40 divisors (see below), whose sum is σ = 2378419200. Its totient is φ = 408382208.

The previous prime is 1021965653. The next prime is 1021965683. The reversal of 1021965680 is 865691201.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021965683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82961 + ... + 94479.

It is an arithmetic number, because the mean of its divisors is an integer number (59460480).

Almost surely, 2^1021965680 is an apocalyptic number.

1021965680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021965680 is an abundant number, since it is smaller than the sum of its proper divisors (1356453520).

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

1021965680 is a wasteful number, since it uses less digits than its factorization.

1021965680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12641 (or 12635 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 1021965680 is about 31968.1979473351. The cubic root of 1021965680 is about 1007.2689279956.

The spelling of 1021965680 in words is "one billion, twenty-one million, nine hundred sixty-five thousand, six hundred eighty".