400520523 has 32 divisors (see below), whose sum is σ = 601909056. Its totient is φ = 235243008.

The previous prime is 400520521. The next prime is 400520531. The reversal of 400520523 is 325025004.

It is not a de Polignac number, because 400520523 - 2¹ = 400520521 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400520523.

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 31 ways as a sum of consecutive naturals, for example, 73861 + ... + 79097.

It is an arithmetic number, because the mean of its divisors is an integer number (18809658).

Almost surely, 2^400520523 is an apocalyptic number.

400520523 is a deficient number, since it is larger than the sum of its proper divisors (201388533).

400520523 is a wasteful number, since it uses less digits than its factorization.

400520523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5343.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 400520523 is about 20013.0088442493. The cubic root of 400520523 is about 737.1257650485.

Adding to 400520523 its reverse (325025004), we get a palindrome (725545527).

The spelling of 400520523 in words is "four hundred million, five hundred twenty thousand, five hundred twenty-three".