1001233220 has 48 divisors (see below), whose sum is σ = 2267469120. Its totient is φ = 369173376.

The previous prime is 1001233201. The next prime is 1001233231. The reversal of 1001233220 is 223321001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1001233195 and 1001233204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221099 + ... + 225581.

It is an arithmetic number, because the mean of its divisors is an integer number (47238940).

Almost surely, 2^1001233220 is an apocalyptic number.

1001233220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001233220 is an abundant number, since it is smaller than the sum of its proper divisors (1266235900).

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

1001233220 is a wasteful number, since it uses less digits than its factorization.

1001233220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5364 (or 5362 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1001233220 is about 31642.2695140535. The cubic root of 1001233220 is about 1000.4109044677.

Adding to 1001233220 its reverse (223321001), we get a palindrome (1224554221).

The spelling of 1001233220 in words is "one billion, one million, two hundred thirty-three thousand, two hundred twenty".