400543524 has 18 divisors (see below), whose sum is σ = 1012485110. Its totient is φ = 133514496.

The previous prime is 400543519. The next prime is 400543531. The reversal of 400543524 is 425345004.

It can be written as a sum of positive squares in only one way, i.e., 398721024 + 1822500 = 19968^2 + 1350^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×400543524² = 320870229236677152, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5563069 + ... + 5563140.

Almost surely, 2^400543524 is an apocalyptic number.

It is an amenable number.

400543524 is an abundant number, since it is smaller than the sum of its proper divisors (611941586).

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

400543524 is a wasteful number, since it uses less digits than its factorization.

400543524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11126219 (or 11126214 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 27.

The square root of 400543524 is about 20013.5834872219. The cubic root of 400543524 is about 737.1398752745.

Adding to 400543524 its reverse (425345004), we get a palindrome (825888528).

The spelling of 400543524 in words is "four hundred million, five hundred forty-three thousand, five hundred twenty-four".