1225442500 has 60 divisors (see below), whose sum is σ = 2706383680. Its totient is φ = 485316000.

The previous prime is 1225442489. The next prime is 1225442503. The reversal of 1225442500 is 52445221.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (1225442503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 255121 + ... + 259879.

Almost surely, 2^1225442500 is an apocalyptic number.

1225442500 is a gapful number since it is divisible by the number (10) 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 1225442500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1353191840).

1225442500 is an abundant number, since it is smaller than the sum of its proper divisors (1480941180).

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

1225442500 is a wasteful number, since it uses less digits than its factorization.

1225442500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4886 (or 4869 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 1225442500 is about 35006.3208578108. The cubic root of 1225442500 is about 1070.1163002826.

Adding to 1225442500 its reverse (52445221), we get a palindrome (1277887721).

The spelling of 1225442500 in words is "one billion, two hundred twenty-five million, four hundred forty-two thousand, five hundred".