523520401440 has 48 divisors (see below), whose sum is σ = 1649089266048. Its totient is φ = 139605440256.

The previous prime is 523520401433. The next prime is 523520401447. The reversal of 523520401440 is 44104025325.

It is an interprime number because it is at equal distance from previous prime (523520401433) and next prime (523520401447).

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×523520401440² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 523520401398 and 523520401407.

It is not an unprimeable number, because it can be changed into a prime (523520401447) 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, 545333272 + ... + 545334231.

It is an arithmetic number, because the mean of its divisors is an integer number (34356026376).

Almost surely, 2^523520401440 is an apocalyptic number.

It is an amenable number.

523520401440 is an abundant number, since it is smaller than the sum of its proper divisors (1125568864608).

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

523520401440 is a wasteful number, since it uses less digits than its factorization.

523520401440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1090667521 (or 1090667513 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 523520401440 its reverse (44104025325), we get a palindrome (567624426765).

The spelling of 523520401440 in words is "five hundred twenty-three billion, five hundred twenty million, four hundred one thousand, four hundred forty".