1225478916 has 96 divisors (see below), whose sum is σ = 3328174080. Its totient is φ = 389217312.

The previous prime is 1225478909. The next prime is 1225478921. The reversal of 1225478916 is 6198745221.

1225478916 is a `hidden beast` number, since 1 + 22 + 547 + 89 + 1 + 6 = 666.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 761785 + ... + 763391.

It is an arithmetic number, because the mean of its divisors is an integer number (34668480).

Almost surely, 2^1225478916 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 1225478916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1664087040).

1225478916 is an abundant number, since it is smaller than the sum of its proper divisors (2102695164).

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

1225478916 is a wasteful number, since it uses less digits than its factorization.

1225478916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1950 (or 1942 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 1225478916 is about 35006.8409885839. The cubic root of 1225478916 is about 1070.1269002548.

The spelling of 1225478916 in words is "one billion, two hundred twenty-five million, four hundred seventy-eight thousand, nine hundred sixteen".