523117440 has 160 divisors (see below), whose sum is σ = 1868331960. Its totient is φ = 139484160.

The previous prime is 523117417. The next prime is 523117471. The reversal of 523117440 is 44711325.

It is a tau number, because it is divible by the number of its divisors (160).

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

It is a congruent number.

It is an unprimeable number.

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, 46795 + ... + 56885.

Almost surely, 2^523117440 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 523117440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (934165980).

523117440 is an abundant number, since it is smaller than the sum of its proper divisors (1345214520).

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

523117440 is a wasteful number, since it uses less digits than its factorization.

523117440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10122 (or 10101 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 523117440 is about 22871.7607542576. The cubic root of 523117440 is about 805.7489217472.

Adding to 523117440 its reverse (44711325), we get a palindrome (567828765).

The spelling of 523117440 in words is "five hundred twenty-three million, one hundred seventeen thousand, four hundred forty".