1443686749 has 4 divisors (see below), whose sum is σ = 1452882364. Its totient is φ = 1434491136.

The previous prime is 1443686737. The next prime is 1443686759. The reversal of 1443686749 is 9476863441.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9476863441 = 67 ⋅141445723.

It can be written as a sum of positive squares in 2 ways, for example, as 951290649 + 492396100 = 30843^2 + 22190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1443686749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1443686696 and 1443686705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1443686719) 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, 4597572 + ... + 4597885.

It is an arithmetic number, because the mean of its divisors is an integer number (363220591).

Almost surely, 2^1443686749 is an apocalyptic number.

It is an amenable number.

1443686749 is a deficient number, since it is larger than the sum of its proper divisors (9195615).

1443686749 is an equidigital number, since it uses as much as digits as its factorization.

1443686749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9195614.

The product of its digits is 3483648, while the sum is 52.

The square root of 1443686749 is about 37995.8780527572. The cubic root of 1443686749 is about 1130.2061255013.

The spelling of 1443686749 in words is "one billion, four hundred forty-three million, six hundred eighty-six thousand, seven hundred forty-nine".