1393887838861 has 48 divisors (see below), whose sum is σ = 1666527075840. Its totient is φ = 1162046995200.

The previous prime is 1393887838859. The next prime is 1393887838939. The reversal of 1393887838861 is 1688387883931.

It is not a de Polignac number, because 1393887838861 - 2¹ = 1393887838859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (73).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1393887838061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 273255211 + ... + 273260311.

It is an arithmetic number, because the mean of its divisors is an integer number (34719314080).

Almost surely, 2^{1393887838861} is an apocalyptic number.

It is an amenable number.

1393887838861 is a deficient number, since it is larger than the sum of its proper divisors (272639236979).

1393887838861 is an equidigital number, since it uses as much as digits as its factorization.

1393887838861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6234 (or 6227 counting only the distinct ones).

The product of its digits is 334430208, while the sum is 73.

The spelling of 1393887838861 in words is "one trillion, three hundred ninety-three billion, eight hundred eighty-seven million, eight hundred thirty-eight thousand, eight hundred sixty-one".