400144500 has 144 divisors (see below), whose sum is σ = 1442767872. Its totient is φ = 91454400.

The previous prime is 400144499. The next prime is 400144517. The reversal of 400144500 is 5441004.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 25149 + ... + 37851.

Almost surely, 2^400144500 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 400144500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (721383936).

400144500 is an abundant number, since it is smaller than the sum of its proper divisors (1042623372).

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

400144500 is a wasteful number, since it uses less digits than its factorization.

400144500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12735 (or 12720 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 400144500 is about 20003.6121738050. The cubic root of 400144500 is about 736.8950128050.

Adding to 400144500 its reverse (5441004), we get a palindrome (405585504).

The spelling of 400144500 in words is "four hundred million, one hundred forty-four thousand, five hundred".