400541544 has 128 divisors (see below), whose sum is σ = 1216656000. Its totient is φ = 121347072.

The previous prime is 400541521. The next prime is 400541621. The reversal of 400541544 is 445145004.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 31 ways as a sum of consecutive naturals, for example, 187072 + ... + 189200.

It is an arithmetic number, because the mean of its divisors is an integer number (9505125).

Almost surely, 2^400541544 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 400541544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (608328000).

400541544 is an abundant number, since it is smaller than the sum of its proper divisors (816114456).

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

400541544 is a wasteful number, since it uses less digits than its factorization.

400541544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2224 (or 2214 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 27.

The square root of 400541544 is about 20013.5340207571. The cubic root of 400541544 is about 737.1386606421.

Adding to 400541544 its reverse (445145004), we get a palindrome (845686548).

The spelling of 400541544 in words is "four hundred million, five hundred forty-one thousand, five hundred forty-four".