400544452 has 48 divisors (see below), whose sum is σ = 876274560. Its totient is φ = 155635200.

The previous prime is 400544449. The next prime is 400544461. The reversal of 400544452 is 254445004.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 400544452.

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, 128124 + ... + 131212.

It is an arithmetic number, because the mean of its divisors is an integer number (18255720).

Almost surely, 2^400544452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400544452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (438137280).

400544452 is an abundant number, since it is smaller than the sum of its proper divisors (475730108).

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

400544452 is a wasteful number, since it uses less digits than its factorization.

400544452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3532 (or 3530 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 28.

The square root of 400544452 is about 20013.6066714623. The cubic root of 400544452 is about 737.1404445553.

Adding to 400544452 its reverse (254445004), we get a palindrome (654989456).

The spelling of 400544452 in words is "four hundred million, five hundred forty-four thousand, four hundred fifty-two".