400520520 has 96 divisors (see below), whose sum is σ = 1318262400. Its totient is φ = 105446016.

The previous prime is 400520501. The next prime is 400520521. The reversal of 400520520 is 25025004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 400520493 and 400520502.

It is not an unprimeable number, because it can be changed into a prime (400520521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21399 + ... + 35481.

It is an arithmetic number, because the mean of its divisors is an integer number (13731900).

Almost surely, 2^400520520 is an apocalyptic number.

400520520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400520520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (659131200).

400520520 is an abundant number, since it is smaller than the sum of its proper divisors (917741880).

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

400520520 is a wasteful number, since it uses less digits than its factorization.

400520520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14179 (or 14172 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 400520520 is about 20013.0087692980. The cubic root of 400520520 is about 737.1257632081.

Adding to 400520520 its reverse (25025004), we get a palindrome (425545524).

The spelling of 400520520 in words is "four hundred million, five hundred twenty thousand, five hundred twenty".