1000565120 has 64 divisors (see below), whose sum is σ = 2402773200. Its totient is φ = 398419968.

The previous prime is 1000565119. The next prime is 1000565123. The reversal of 1000565120 is 215650001.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1000565120² = 2002261118721228800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1000565092 and 1000565101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000565123) 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, 143147 + ... + 149973.

Almost surely, 2^1000565120 is an apocalyptic number.

1000565120 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 1000565120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1201386600).

1000565120 is an abundant number, since it is smaller than the sum of its proper divisors (1402208080).

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

1000565120 is an equidigital number, since it uses as much as digits as its factorization.

1000565120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7075 (or 7063 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1000565120 is about 31631.7106714133. The cubic root of 1000565120 is about 1000.1883378600.

The spelling of 1000565120 in words is "one billion, five hundred sixty-five thousand, one hundred twenty".