521244408 has 32 divisors (see below), whose sum is σ = 1310924160. Its totient is φ = 172706400.

The previous prime is 521244407. The next prime is 521244443. The reversal of 521244408 is 804442125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521244407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61018 + ... + 69033.

It is an arithmetic number, because the mean of its divisors is an integer number (40966380).

Almost surely, 2^521244408 is an apocalyptic number.

It is an amenable number.

521244408 is an abundant number, since it is smaller than the sum of its proper divisors (789679752).

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

521244408 is a wasteful number, since it uses less digits than its factorization.

521244408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130227 (or 130223 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 30.

The square root of 521244408 is about 22830.7776477281. Note that the first 3 decimals coincide. The cubic root of 521244408 is about 804.7861052280.

The spelling of 521244408 in words is "five hundred twenty-one million, two hundred forty-four thousand, four hundred eight".