1381440399947 has 4 divisors (see below), whose sum is σ = 1413566920920. Its totient is φ = 1349313878976.

The previous prime is 1381440399839. The next prime is 1381440399959. The reversal of 1381440399947 is 7499930441831.

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 1381440399947 - 2²⁶ = 1381373291083 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 1381440399947.

It is not an unprimeable number, because it can be changed into a prime (1381440399247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16063260422 + ... + 16063260507.

It is an arithmetic number, because the mean of its divisors is an integer number (353391730230).

Almost surely, 2^{1381440399947} is an apocalyptic number.

1381440399947 is a deficient number, since it is larger than the sum of its proper divisors (32126520973).

1381440399947 is an equidigital number, since it uses as much as digits as its factorization.

1381440399947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32126520972.

The product of its (nonzero) digits is 23514624, while the sum is 62.

The spelling of 1381440399947 in words is "one trillion, three hundred eighty-one billion, four hundred forty million, three hundred ninety-nine thousand, nine hundred forty-seven".