1285984393 has 4 divisors (see below), whose sum is σ = 1317349908. Its totient is φ = 1254618880.

The previous prime is 1285984327. The next prime is 1285984457. The reversal of 1285984393 is 3934895821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 532317184 + 753667209 = 23072^2 + 27453^2 .

It is a cyclic number.

It is not a de Polignac number, because 1285984393 - 2²⁵ = 1252429961 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 1285984393.

It is not an unprimeable number, because it can be changed into a prime (1285984313) 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, 15682696 + ... + 15682777.

It is an arithmetic number, because the mean of its divisors is an integer number (329337477).

Almost surely, 2^1285984393 is an apocalyptic number.

It is an amenable number.

1285984393 is a deficient number, since it is larger than the sum of its proper divisors (31365515).

1285984393 is an equidigital number, since it uses as much as digits as its factorization.

1285984393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31365514.

The product of its digits is 1866240, while the sum is 52.

The square root of 1285984393 is about 35860.6245483818. The cubic root of 1285984393 is about 1087.4565145425.

The spelling of 1285984393 in words is "one billion, two hundred eighty-five million, nine hundred eighty-four thousand, three hundred ninety-three".