1438021443865 has 8 divisors (see below), whose sum is σ = 1739213337600. Its totient is φ = 1141358751792.

The previous prime is 1438021443839. The next prime is 1438021443893. The reversal of 1438021443865 is 5683441208341.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1438021443865 is a prime.

It is a super-2 number, since 2×1438021443865² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1132299715 + ... + 1132300984.

It is an arithmetic number, because the mean of its divisors is an integer number (217401667200).

Almost surely, 2^{1438021443865} is an apocalyptic number.

It is an amenable number.

1438021443865 is a deficient number, since it is larger than the sum of its proper divisors (301191893735).

1438021443865 is a wasteful number, since it uses less digits than its factorization.

1438021443865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2264600831.

The product of its (nonzero) digits is 2211840, while the sum is 49.

The spelling of 1438021443865 in words is "one trillion, four hundred thirty-eight billion, twenty-one million, four hundred forty-three thousand, eight hundred sixty-five".