522249840 has 360 divisors, whose sum is σ = 2074005648. Its totient is φ = 117411840.

The previous prime is 522249823. The next prime is 522249851. The reversal of 522249840 is 48942225.

522249840 is a `hidden beast` number, since 522 + 2 + 4 + 98 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (360).

It is a super-4 number, since 4×522249840⁴ (a number of 36 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 522249795 and 522249804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 3986575 + ... + 3986705.

Almost surely, 2^522249840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 522249840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1037002824).

522249840 is an abundant number, since it is smaller than the sum of its proper divisors (1551755808).

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

522249840 is a wasteful number, since it uses less digits than its factorization.

522249840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 522249840 is about 22852.7862633859. The cubic root of 522249840 is about 805.3032254020.

The spelling of 522249840 in words is "five hundred twenty-two million, two hundred forty-nine thousand, eight hundred forty".