1443934681 has 4 divisors (see below), whose sum is σ = 1650211072. Its totient is φ = 1237658292.

The previous prime is 1443934669. The next prime is 1443934691. The reversal of 1443934681 is 1864393441.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1443934681 - 2⁹ = 1443934169 is a prime.

It is a super-2 number, since 2×1443934681² = 4169894725989143522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1443934651) 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, 103138185 + ... + 103138198.

It is an arithmetic number, because the mean of its divisors is an integer number (412552768).

Almost surely, 2^1443934681 is an apocalyptic number.

It is an amenable number.

1443934681 is a deficient number, since it is larger than the sum of its proper divisors (206276391).

1443934681 is an equidigital number, since it uses as much as digits as its factorization.

1443934681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206276390.

The product of its digits is 248832, while the sum is 43.

The square root of 1443934681 is about 37999.1405297541. The cubic root of 1443934681 is about 1130.2708205667.

The spelling of 1443934681 in words is "one billion, four hundred forty-three million, nine hundred thirty-four thousand, six hundred eighty-one".