1214728639 has 4 divisors (see below), whose sum is σ = 1235317320. Its totient is φ = 1194139960.

The previous prime is 1214728637. The next prime is 1214728651. The reversal of 1214728639 is 9368274121.

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 1214728639 - 2¹ = 1214728637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1214728595 and 1214728604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1214728633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10294252 + ... + 10294369.

It is an arithmetic number, because the mean of its divisors is an integer number (308829330).

Almost surely, 2^1214728639 is an apocalyptic number.

1214728639 is a deficient number, since it is larger than the sum of its proper divisors (20588681).

1214728639 is an equidigital number, since it uses as much as digits as its factorization.

1214728639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20588680.

The product of its digits is 145152, while the sum is 43.

The square root of 1214728639 is about 34852.9573924509. The cubic root of 1214728639 is about 1066.9885449281.

The spelling of 1214728639 in words is "one billion, two hundred fourteen million, seven hundred twenty-eight thousand, six hundred thirty-nine".