1366409 has 8 divisors (see below), whose sum is σ = 1578528. Its totient is φ = 1168960.

The previous prime is 1366397. The next prime is 1366427. The reversal of 1366409 is 9046631.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1366409 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1366459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3467 + ... + 3840.

It is an arithmetic number, because the mean of its divisors is an integer number (197316).

2^1366409 is an apocalyptic number.

It is an amenable number.

1366409 is a deficient number, since it is larger than the sum of its proper divisors (212119).

1366409 is a wasteful number, since it uses less digits than its factorization.

1366409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7335.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 1366409 is about 1168.9349853606. The cubic root of 1366409 is about 110.9669300614.

The spelling of 1366409 in words is "one million, three hundred sixty-six thousand, four hundred nine".