1368649 has 4 divisors (see below), whose sum is σ = 1371136. Its totient is φ = 1366164.

The previous prime is 1368643. The next prime is 1368659. The reversal of 1368649 is 9468631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1368649 - 2⁵ = 1368617 is a prime.

It is a Duffinian number.

1368649 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1368643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9 + ... + 1654.

It is an arithmetic number, because the mean of its divisors is an integer number (342784).

2^1368649 is an apocalyptic number.

It is an amenable number.

1368649 is a deficient number, since it is larger than the sum of its proper divisors (2487).

1368649 is an equidigital number, since it uses as much as digits as its factorization.

1368649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2486.

The product of its digits is 31104, while the sum is 37.

The square root of 1368649 is about 1169.8927301253. The cubic root of 1368649 is about 111.0275342240.

The spelling of 1368649 in words is "one million, three hundred sixty-eight thousand, six hundred forty-nine".