1212638616 has 48 divisors (see below), whose sum is σ = 3753406800. Its totient is φ = 346468032.

The previous prime is 1212638593. The next prime is 1212638621. The reversal of 1212638616 is 6168362121.

It is a happy number.

1212638616 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 6 + 38 + 616 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

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, 1202511 + ... + 1203518.

It is an arithmetic number, because the mean of its divisors is an integer number (78195975).

Almost surely, 2^1212638616 is an apocalyptic number.

It is an amenable number.

1212638616 is an abundant number, since it is smaller than the sum of its proper divisors (2540768184).

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

1212638616 is a wasteful number, since it uses less digits than its factorization.

1212638616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2406048 (or 2406041 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 1212638616 is about 34822.9610458387. The cubic root of 1212638616 is about 1066.3762515799.

The spelling of 1212638616 in words is "one billion, two hundred twelve million, six hundred thirty-eight thousand, six hundred sixteen".