1097985520 has 20 divisors (see below), whose sum is σ = 2552816520. Its totient is φ = 439194176.

The previous prime is 1097985491. The next prime is 1097985599. The reversal of 1097985520 is 255897901.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6862330 + ... + 6862489.

It is an arithmetic number, because the mean of its divisors is an integer number (127640826).

Almost surely, 2^1097985520 is an apocalyptic number.

1097985520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1097985520 is an abundant number, since it is smaller than the sum of its proper divisors (1454831000).

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

1097985520 is a wasteful number, since it uses less digits than its factorization.

1097985520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13724832 (or 13724826 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 46.

The square root of 1097985520 is about 33135.8645579076. The cubic root of 1097985520 is about 1031.6495765556.

The spelling of 1097985520 in words is "one billion, ninety-seven million, nine hundred eighty-five thousand, five hundred twenty".