225139400 has 96 divisors (see below), whose sum is σ = 548000640. Its totient is φ = 85935360.

The previous prime is 225139333. The next prime is 225139429. The reversal of 225139400 is 4931522.

It is a self number, because there is not a number n which added to its sum of digits gives 225139400.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 403922 + ... + 404478.

It is an arithmetic number, because the mean of its divisors is an integer number (5708340).

Almost surely, 2^225139400 is an apocalyptic number.

225139400 is a gapful number since it is divisible by the number (20) 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 225139400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (274000320).

225139400 is an abundant number, since it is smaller than the sum of its proper divisors (322861240).

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

225139400 is a wasteful number, since it uses less digits than its factorization.

225139400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 225139400 is about 15004.6459471725. The cubic root of 225139400 is about 608.3457823603.

It can be divided in two parts, 22513 and 9400, that added together give a palindrome (31913).

The spelling of 225139400 in words is "two hundred twenty-five million, one hundred thirty-nine thousand, four hundred".