1212455642 has 16 divisors (see below), whose sum is σ = 1866463872. Its totient is φ = 590494320.

The previous prime is 1212455639. The next prime is 1212455653. The reversal of 1212455642 is 2465542121.

It is a junction number, because it is equal to n+sod(n) for n = 1212455599 and 1212455608.

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 7 ways as a sum of consecutive naturals, for example, 35678 + ... + 60809.

It is an arithmetic number, because the mean of its divisors is an integer number (116653992).

Almost surely, 2^1212455642 is an apocalyptic number.

1212455642 is a deficient number, since it is larger than the sum of its proper divisors (654008230).

1212455642 is a wasteful number, since it uses less digits than its factorization.

1212455642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96653.

The product of its digits is 19200, while the sum is 32.

The square root of 1212455642 is about 34820.3337433747. Note that the first 3 decimals coincide. The cubic root of 1212455642 is about 1066.3226140163.

Adding to 1212455642 its reverse (2465542121), we get a palindrome (3677997763).

The spelling of 1212455642 in words is "one billion, two hundred twelve million, four hundred fifty-five thousand, six hundred forty-two".