1000805520 has 320 divisors, whose sum is σ = 3690263808. Its totient is φ = 223027200.

The previous prime is 1000805503. The next prime is 1000805527. The reversal of 1000805520 is 255080001.

It is a super-2 number, since 2×1000805520² = 2003223377724940800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1000805527) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4152600 + ... + 4152840.

Almost surely, 2^1000805520 is an apocalyptic number.

1000805520 is a gapful number since it is divisible by the number (10) 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 1000805520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1845131904).

1000805520 is an abundant number, since it is smaller than the sum of its proper divisors (2689458288).

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

1000805520 is a wasteful number, since it uses less digits than its factorization.

1000805520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 1000805520 is about 31635.5104273663. The cubic root of 1000805520 is about 1000.2684346031.

Adding to 1000805520 its reverse (255080001), we get a palindrome (1255885521).

The spelling of 1000805520 in words is "one billion, eight hundred five thousand, five hundred twenty".