522639390 has 128 divisors (see below), whose sum is σ = 1575705600. Its totient is φ = 110242944.

The previous prime is 522639379. The next prime is 522639391. The reversal of 522639390 is 93936225.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (522639391) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 131817 + ... + 135723.

It is an arithmetic number, because the mean of its divisors is an integer number (12310200).

Almost surely, 2^522639390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 522639390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787852800).

522639390 is an abundant number, since it is smaller than the sum of its proper divisors (1053066210).

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

522639390 is a wasteful number, since it uses less digits than its factorization.

522639390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951 (or 3937 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 39.

The square root of 522639390 is about 22861.3077053785. The cubic root of 522639390 is about 805.5034028402.

The spelling of 522639390 in words is "five hundred twenty-two million, six hundred thirty-nine thousand, three hundred ninety".