1000022500 has 30 divisors (see below), whose sum is σ = 2186854670. Its totient is φ = 400008000.

The previous prime is 1000022461. The next prime is 1000022533. The reversal of 1000022500 is 52200001.

It can be written as a sum of positive squares in 5 ways, for example, as 153561664 + 846460836 = 12392^2 + 29094^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

1000022500 is a modest number, since divided by 22500 gives 10000 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 197505 + ... + 202504.

Almost surely, 2^1000022500 is an apocalyptic number.

1000022500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1000022500 is an abundant number, since it is smaller than the sum of its proper divisors (1186832170).

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

1000022500 is an equidigital number, since it uses as much as digits as its factorization.

1000022500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400033 (or 400016 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 10.

The square root of 1000022500 is about 31623.1323559195. The cubic root of 1000022500 is about 1000.0074999438.

Adding to 1000022500 its reverse (52200001), we get a palindrome (1052222501).

It can be divided in two parts, 10000 and 22500, that multiplied together give a square (225000000 = 15000²).

The spelling of 1000022500 in words is "one billion, twenty-two thousand, five hundred".