1278899 has 2 divisors, whose sum is σ = 1278900. Its totient is φ = 1278898.

The previous prime is 1278881. The next prime is 1278911. The reversal of 1278899 is 9988721.

It is a strong prime.

It is an emirp because it is prime and its reverse (9988721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1278899 - 2¹² = 1274803 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1278839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639449 + 639450.

It is an arithmetic number, because the mean of its divisors is an integer number (639450).

2^1278899 is an apocalyptic number.

1278899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278899 is an equidigital number, since it uses as much as digits as its factorization.

1278899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 44.

The square root of 1278899 is about 1130.8841673664. The cubic root of 1278899 is about 108.5455647567.

The spelling of 1278899 in words is "one million, two hundred seventy-eight thousand, eight hundred ninety-nine".