1320605 has 16 divisors (see below), whose sum is σ = 1862784. Its totient is φ = 886080.

The previous prime is 1320541. The next prime is 1320607. The reversal of 1320605 is 5060231.

It is not a de Polignac number, because 1320605 - 2⁶ = 1320541 is a prime.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209 + ... + 1638.

It is an arithmetic number, because the mean of its divisors is an integer number (116424).

2^1320605 is an apocalyptic number.

It is an amenable number.

1320605 is a deficient number, since it is larger than the sum of its proper divisors (542179).

1320605 is a wasteful number, since it uses less digits than its factorization.

1320605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876.

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 1320605 is about 1149.1757916002. The cubic root of 1320605 is about 109.7128876200.

Adding to 1320605 its reverse (5060231), we get a palindrome (6380836).

The spelling of 1320605 in words is "one million, three hundred twenty thousand, six hundred five".