1381343447 has 4 divisors (see below), whose sum is σ = 1506920136. Its totient is φ = 1255766760.

The previous prime is 1381343441. The next prime is 1381343461. The reversal of 1381343447 is 7443431831.

It is a happy number.

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 1381343447 - 2⁸ = 1381343191 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1381343447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381343441) 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, 62788328 + ... + 62788349.

It is an arithmetic number, because the mean of its divisors is an integer number (376730034).

Almost surely, 2^1381343447 is an apocalyptic number.

1381343447 is a deficient number, since it is larger than the sum of its proper divisors (125576689).

1381343447 is a wasteful number, since it uses less digits than its factorization.

1381343447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125576688.

The product of its digits is 96768, while the sum is 38.

The square root of 1381343447 is about 37166.4290321252. The cubic root of 1381343447 is about 1113.6974465418.

The spelling of 1381343447 in words is "one billion, three hundred eighty-one million, three hundred forty-three thousand, four hundred forty-seven".