550138400 has 144 divisors (see below), whose sum is σ = 1584898560. Its totient is φ = 182476800.

The previous prime is 550138399. The next prime is 550138409. The reversal of 550138400 is 4831055.

It is a self number, because there is not a number n which added to its sum of digits gives 550138400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (550138409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 172016 + ... + 175184.

It is an arithmetic number, because the mean of its divisors is an integer number (11006240).

Almost surely, 2^550138400 is an apocalyptic number.

550138400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 550138400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792449280).

550138400 is an abundant number, since it is smaller than the sum of its proper divisors (1034760160).

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

550138400 is a wasteful number, since it uses less digits than its factorization.

550138400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3227 (or 3214 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 550138400 is about 23455.0293114291. The cubic root of 550138400 is about 819.3899885121.

Adding to 550138400 its reverse (4831055), we get a palindrome (554969455).

The spelling of 550138400 in words is "five hundred fifty million, one hundred thirty-eight thousand, four hundred".