1366989 has 8 divisors (see below), whose sum is σ = 1962912. Its totient is φ = 841200.

The previous prime is 1366979. The next prime is 1366991. The reversal of 1366989 is 9896631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1366989 - 2⁵ = 1366957 is a prime.

It is a super-2 number, since 2×1366989² = 3737317852242, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1366989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366979) 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 7 ways as a sum of consecutive naturals, for example, 17487 + ... + 17564.

It is an arithmetic number, because the mean of its divisors is an integer number (245364).

2^1366989 is an apocalyptic number.

It is an amenable number.

1366989 is a deficient number, since it is larger than the sum of its proper divisors (595923).

1366989 is a wasteful number, since it uses less digits than its factorization.

1366989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35067.

The product of its digits is 69984, while the sum is 42.

The square root of 1366989 is about 1169.1830481152. The cubic root of 1366989 is about 110.9826285614.

Adding to 1366989 its sum of digits (42), we get a triangular number (1367031 = T₁₆₅₃).

The spelling of 1366989 in words is "one million, three hundred sixty-six thousand, nine hundred eighty-nine".