1223147520 has 480 divisors, whose sum is σ = 5033011200. Its totient is φ = 276037632.

The previous prime is 1223147503. The next prime is 1223147531. The reversal of 1223147520 is 257413221.

1223147520 is a `hidden beast` number, since 122 + 3 + 14 + 7 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15482841 + ... + 15482919.

It is an arithmetic number, because the mean of its divisors is an integer number (10485440).

Almost surely, 2^1223147520 is an apocalyptic number.

1223147520 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 1223147520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2516505600).

1223147520 is an abundant number, since it is smaller than the sum of its proper divisors (3809863680).

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

1223147520 is an frugal number, since it uses more digits than its factorization.

1223147520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128 (or 96 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 1223147520 is about 34973.5259875238. The cubic root of 1223147520 is about 1069.4478532473.

The spelling of 1223147520 in words is "one billion, two hundred twenty-three million, one hundred forty-seven thousand, five hundred twenty".