1381997743 has 4 divisors (see below), whose sum is σ = 1579426000. Its totient is φ = 1184569488.

The previous prime is 1381997719. The next prime is 1381997759. The reversal of 1381997743 is 3477991831.

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 1381997743 - 2²⁵ = 1348443311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381977743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98714118 + ... + 98714131.

It is an arithmetic number, because the mean of its divisors is an integer number (394856500).

Almost surely, 2^1381997743 is an apocalyptic number.

1381997743 is a deficient number, since it is larger than the sum of its proper divisors (197428257).

1381997743 is an equidigital number, since it uses as much as digits as its factorization.

1381997743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197428256.

The product of its digits is 1143072, while the sum is 52.

The square root of 1381997743 is about 37175.2302346603. The cubic root of 1381997743 is about 1113.8732591453.

The spelling of 1381997743 in words is "one billion, three hundred eighty-one million, nine hundred ninety-seven thousand, seven hundred forty-three".