1218621439 has 32 divisors (see below), whose sum is σ = 1462579200. Its totient is φ = 993496320.

The previous prime is 1218621433. The next prime is 1218621451. The reversal of 1218621439 is 9341268121.

It is a cyclic number.

It is not a de Polignac number, because 1218621439 - 2⁵ = 1218621407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1218621398 and 1218621407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218621433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5321377 + ... + 5321605.

It is an arithmetic number, because the mean of its divisors is an integer number (45705600).

Almost surely, 2^1218621439 is an apocalyptic number.

1218621439 is a deficient number, since it is larger than the sum of its proper divisors (243957761).

1218621439 is a wasteful number, since it uses less digits than its factorization.

1218621439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583.

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

The square root of 1218621439 is about 34908.7587719758. The cubic root of 1218621439 is about 1068.1271103159.

The spelling of 1218621439 in words is "one billion, two hundred eighteen million, six hundred twenty-one thousand, four hundred thirty-nine".