521423244 has 60 divisors (see below), whose sum is σ = 1369151784. Its totient is φ = 173036736.

The previous prime is 521423239. The next prime is 521423249. The reversal of 521423244 is 442324125.

It is an interprime number because it is at equal distance from previous prime (521423239) and next prime (521423249).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (521423249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 72039 + ... + 78945.

Almost surely, 2^521423244 is an apocalyptic number.

521423244 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 521423244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (684575892).

521423244 is an abundant number, since it is smaller than the sum of its proper divisors (847728540).

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

521423244 is a wasteful number, since it uses less digits than its factorization.

521423244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7156 (or 7145 counting only the distinct ones).

The product of its digits is 7680, while the sum is 27.

The square root of 521423244 is about 22834.6938670086. The cubic root of 521423244 is about 804.8781338867.

Adding to 521423244 its reverse (442324125), we get a palindrome (963747369).

The spelling of 521423244 in words is "five hundred twenty-one million, four hundred twenty-three thousand, two hundred forty-four".