1004131220 has 12 divisors (see below), whose sum is σ = 2108675604. Its totient is φ = 401652480.

The previous prime is 1004131201. The next prime is 1004131237. The reversal of 1004131220 is 221314001.

It can be written as a sum of positive squares in 2 ways, for example, as 111555844 + 892575376 = 10562^2 + 29876^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1004131195 and 1004131204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25103261 + ... + 25103300.

It is an arithmetic number, because the mean of its divisors is an integer number (175722967).

Almost surely, 2^1004131220 is an apocalyptic number.

1004131220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1004131220 is an abundant number, since it is smaller than the sum of its proper divisors (1104544384).

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

1004131220 is a wasteful number, since it uses less digits than its factorization.

1004131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50206570 (or 50206568 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1004131220 is about 31688.0296010970. The cubic root of 1004131220 is about 1001.3751813427.

Adding to 1004131220 its reverse (221314001), we get a palindrome (1225445221).

The spelling of 1004131220 in words is "one billion, four million, one hundred thirty-one thousand, two hundred twenty".