1920605 has 8 divisors (see below), whose sum is σ = 2379264. Its totient is φ = 1486800.

The previous prime is 1920601. The next prime is 1920613. The reversal of 1920605 is 5060291.

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

It is not a de Polignac number, because 1920605 - 2² = 1920601 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920601) 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, 6041 + ... + 6350.

It is an arithmetic number, because the mean of its divisors is an integer number (297408).

2^1920605 is an apocalyptic number.

It is an amenable number.

1920605 is a deficient number, since it is larger than the sum of its proper divisors (458659).

1920605 is a wasteful number, since it uses less digits than its factorization.

1920605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12427.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1920605 is about 1385.8589394307. The cubic root of 1920605 is about 124.3023535593.

Adding to 1920605 its reverse (5060291), we get a palindrome (6980896).

The spelling of 1920605 in words is "one million, nine hundred twenty thousand, six hundred five".