1220025312 has 72 divisors (see below), whose sum is σ = 3784861080. Its totient is φ = 369703680.

The previous prime is 1220025277. The next prime is 1220025341. The reversal of 1220025312 is 2135200221.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 189387 + ... + 195722.

It is an arithmetic number, because the mean of its divisors is an integer number (52567515).

Almost surely, 2^1220025312 is an apocalyptic number.

1220025312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1220025312 is an abundant number, since it is smaller than the sum of its proper divisors (2564835768).

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

1220025312 is a wasteful number, since it uses less digits than its factorization.

1220025312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385136 (or 385125 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 1220025312 is about 34928.8607314925. The cubic root of 1220025312 is about 1068.5371198859.

Adding to 1220025312 its reverse (2135200221), we get a palindrome (3355225533).

The spelling of 1220025312 in words is "one billion, two hundred twenty million, twenty-five thousand, three hundred twelve".