1366839 has 6 divisors (see below), whose sum is σ = 1974336. Its totient is φ = 911220.

The previous prime is 1366837. The next prime is 1366843. The reversal of 1366839 is 9386631.

It is a happy number.

It is not a de Polignac number, because 1366839 - 2¹ = 1366837 is a prime.

1366839 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 75927 + ... + 75944.

It is an arithmetic number, because the mean of its divisors is an integer number (329056).

2^1366839 is an apocalyptic number.

1366839 is a deficient number, since it is larger than the sum of its proper divisors (607497).

1366839 is a wasteful number, since it uses less digits than its factorization.

1366839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151877 (or 151874 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1366839 is about 1169.1188990004. The cubic root of 1366839 is about 110.9785690303.

The spelling of 1366839 in words is "one million, three hundred sixty-six thousand, eight hundred thirty-nine".