1220312140 has 24 divisors (see below), whose sum is σ = 2564926560. Its totient is φ = 487692288.

The previous prime is 1220312129. The next prime is 1220312147. The reversal of 1220312140 is 412130221.

It is not an unprimeable number, because it can be changed into a prime (1220312147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3400 + ... + 49519.

It is an arithmetic number, because the mean of its divisors is an integer number (106871940).

Almost surely, 2^1220312140 is an apocalyptic number.

1220312140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220312140 is an abundant number, since it is smaller than the sum of its proper divisors (1344614420).

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

1220312140 is a wasteful number, since it uses less digits than its factorization.

1220312140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54081 (or 54079 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1220312140 is about 34932.9663784798. The cubic root of 1220312140 is about 1068.6208510311.

Adding to 1220312140 its reverse (412130221), we get a palindrome (1632442361).

The spelling of 1220312140 in words is "one billion, two hundred twenty million, three hundred twelve thousand, one hundred forty".