1144664439 has 4 divisors (see below), whose sum is σ = 1526219256. Its totient is φ = 763109624.

The previous prime is 1144664431. The next prime is 1144664471. The reversal of 1144664439 is 9344664411.

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 1144664439 - 2³ = 1144664431 is a prime.

It is a super-2 number, since 2×1144664439² = 2620513355822369442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1144664439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144664431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190777404 + ... + 190777409.

It is an arithmetic number, because the mean of its divisors is an integer number (381554814).

Almost surely, 2^1144664439 is an apocalyptic number.

1144664439 is a deficient number, since it is larger than the sum of its proper divisors (381554817).

1144664439 is an equidigital number, since it uses as much as digits as its factorization.

1144664439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381554816.

The product of its digits is 248832, while the sum is 42.

The square root of 1144664439 is about 33832.8899002140. The cubic root of 1144664439 is about 1046.0667476511.

The spelling of 1144664439 in words is "one billion, one hundred forty-four million, six hundred sixty-four thousand, four hundred thirty-nine".