1225127520 has 144 divisors (see below), whose sum is σ = 4208153040. Its totient is φ = 324559872.

The previous prime is 1225127483. The next prime is 1225127551. The reversal of 1225127520 is 257215221.

1225127520 is a `hidden beast` number, since 12 + 2 + 5 + 127 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×1225127520² = 3001874880522700800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223371 + ... + 228789.

It is an arithmetic number, because the mean of its divisors is an integer number (29223285).

Almost surely, 2^1225127520 is an apocalyptic number.

1225127520 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 1225127520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2104076520).

1225127520 is an abundant number, since it is smaller than the sum of its proper divisors (2983025520).

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

1225127520 is a wasteful number, since it uses less digits than its factorization.

1225127520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5597 (or 5586 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 1225127520 is about 35001.8216668790. The cubic root of 1225127520 is about 1070.0246071145.

The spelling of 1225127520 in words is "one billion, two hundred twenty-five million, one hundred twenty-seven thousand, five hundred twenty".