1212814639 has 4 divisors (see below), whose sum is σ = 1213069000. Its totient is φ = 1212560280.

The previous prime is 1212814619. The next prime is 1212814693. The reversal of 1212814639 is 9364182121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1212814639 - 2¹³ = 1212806447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212814598 and 1212814607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212814609) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 119889 + ... + 129610.

It is an arithmetic number, because the mean of its divisors is an integer number (303267250).

Almost surely, 2^1212814639 is an apocalyptic number.

1212814639 is a deficient number, since it is larger than the sum of its proper divisors (254361).

1212814639 is an equidigital number, since it uses as much as digits as its factorization.

1212814639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254360.

The product of its digits is 20736, while the sum is 37.

The square root of 1212814639 is about 34825.4883526419. The cubic root of 1212814639 is about 1066.4278464142.

The spelling of 1212814639 in words is "one billion, two hundred twelve million, eight hundred fourteen thousand, six hundred thirty-nine".