1285984927 has 2 divisors, whose sum is σ = 1285984928. Its totient is φ = 1285984926.

The previous prime is 1285984883. The next prime is 1285984963. The reversal of 1285984927 is 7294895821.

It is a strong prime.

It is an emirp because it is prime and its reverse (7294895821) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1285984927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1285984327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 642992463 + 642992464.

It is an arithmetic number, because the mean of its divisors is an integer number (642992464).

Almost surely, 2^1285984927 is an apocalyptic number.

1285984927 is a deficient number, since it is larger than the sum of its proper divisors (1).

1285984927 is an equidigital number, since it uses as much as digits as its factorization.

1285984927 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 55.

The square root of 1285984927 is about 35860.6319938732. The cubic root of 1285984927 is about 1087.4566650632.

The spelling of 1285984927 in words is "one billion, two hundred eighty-five million, nine hundred eighty-four thousand, nine hundred twenty-seven".