400454544 has 120 divisors (see below), whose sum is σ = 1213543360. Its totient is φ = 111467520.

The previous prime is 400454543. The next prime is 400454557. The reversal of 400454544 is 445454004.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (400454543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 564462 + ... + 565170.

Almost surely, 2^400454544 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 400454544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (606771680).

400454544 is an abundant number, since it is smaller than the sum of its proper divisors (813088816).

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

400454544 is a wasteful number, since it uses less digits than its factorization.

400454544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809 (or 762 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 30.

The square root of 400454544 is about 20011.3603735478. The cubic root of 400454544 is about 737.0852864805.

Adding to 400454544 its product of nonzero digits (25600), we get a square (400480144 = 20012²).

The spelling of 400454544 in words is "four hundred million, four hundred fifty-four thousand, five hundred forty-four".