521042004 has 96 divisors (see below), whose sum is σ = 1553448960. Its totient is φ = 147941856.

The previous prime is 521041979. The next prime is 521042021. The reversal of 521042004 is 400240125.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124189 + ... + 128315.

It is an arithmetic number, because the mean of its divisors is an integer number (16181760).

Almost surely, 2^521042004 is an apocalyptic number.

521042004 is a gapful number since it is divisible by the number (54) 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 521042004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (776724480).

521042004 is an abundant number, since it is smaller than the sum of its proper divisors (1032406956).

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

521042004 is a wasteful number, since it uses less digits than its factorization.

521042004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314 (or 4306 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 521042004 is about 22826.3445168078. The cubic root of 521042004 is about 804.6819231252.

Adding to 521042004 its reverse (400240125), we get a palindrome (921282129).

The spelling of 521042004 in words is "five hundred twenty-one million, forty-two thousand, four".