4003001220 has 96 divisors (see below), whose sum is σ = 11947824000. Its totient is φ = 997894144.

The previous prime is 4003001207. The next prime is 4003001243. The reversal of 4003001220 is 221003004.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 4003001196 and 4003001205.

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 31 ways as a sum of consecutive naturals, for example, 138811 + ... + 165149.

It is an arithmetic number, because the mean of its divisors is an integer number (124456500).

Almost surely, 2^4003001220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4003001220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5973912000).

4003001220 is an abundant number, since it is smaller than the sum of its proper divisors (7944822780).

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

4003001220 is a wasteful number, since it uses less digits than its factorization.

4003001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26517 (or 26515 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 4003001220 is about 63269.2754818640. The cubic root of 4003001220 is about 1587.7979643651.

Adding to 4003001220 its reverse (221003004), we get a palindrome (4224004224).

The spelling of 4003001220 in words is "four billion, three million, one thousand, two hundred twenty".