400504520 has 64 divisors (see below), whose sum is σ = 1012677120. Its totient is φ = 141444864.

The previous prime is 400504519. The next prime is 400504571. The reversal of 400504520 is 25405004.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 400504492 and 400504501.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4784 + ... + 28703.

It is an arithmetic number, because the mean of its divisors is an integer number (15823080).

Almost surely, 2^400504520 is an apocalyptic number.

400504520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400504520 is an abundant number, since it is smaller than the sum of its proper divisors (612172600).

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

400504520 is a wasteful number, since it uses less digits than its factorization.

400504520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33534 (or 33530 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 400504520 is about 20012.6090253120. The cubic root of 400504520 is about 737.1159475069.

Adding to 400504520 its reverse (25405004), we get a palindrome (425909524).

The spelling of 400504520 in words is "four hundred million, five hundred four thousand, five hundred twenty".