18225570 has 32 divisors (see below), whose sum is σ = 47718720. Its totient is φ = 4418240.

The previous prime is 18225539. The next prime is 18225577. The reversal of 18225570 is 7552281.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (18225577) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27285 + ... + 27944.

It is an arithmetic number, because the mean of its divisors is an integer number (1491210).

Almost surely, 2^18225570 is an apocalyptic number.

18225570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18225570 is an abundant number, since it is smaller than the sum of its proper divisors (29493150).

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

18225570 is a wasteful number, since it uses less digits than its factorization.

18225570 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55250.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 18225570 is about 4269.1415999004. The cubic root of 18225570 is about 263.1643399334.

Subtracting from 18225570 its reverse (7552281), we obtain a square (10673289 = 3267²).

It can be divided in two parts, 182 and 25570, that added together give a palindrome (25752).

The spelling of 18225570 in words is "eighteen million, two hundred twenty-five thousand, five hundred seventy".