1212340420 has 24 divisors (see below), whose sum is σ = 2547216000. Its totient is φ = 484688352.

The previous prime is 1212340369. The next prime is 1212340421. The reversal of 1212340420 is 240432121.

It is not an unprimeable number, because it can be changed into a prime (1212340421) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27541 + ... + 56419.

It is an arithmetic number, because the mean of its divisors is an integer number (106134000).

Almost surely, 2^1212340420 is an apocalyptic number.

1212340420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212340420 is an abundant number, since it is smaller than the sum of its proper divisors (1334875580).

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

1212340420 is a wasteful number, since it uses less digits than its factorization.

1212340420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30987 (or 30985 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1212340420 is about 34818.6791823010. The cubic root of 1212340420 is about 1066.2888347141.

Adding to 1212340420 its reverse (240432121), we get a palindrome (1452772541).

The spelling of 1212340420 in words is "one billion, two hundred twelve million, three hundred forty thousand, four hundred twenty".