1920945 has 16 divisors (see below), whose sum is σ = 3310272. Its totient is φ = 945600.

The previous prime is 1920923. The next prime is 1920959. The reversal of 1920945 is 5490291.

It is a happy number.

It is not a de Polignac number, because 1920945 - 2⁵ = 1920913 is a prime.

1920945 is a lucky number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4731 + ... + 5120.

It is an arithmetic number, because the mean of its divisors is an integer number (206892).

2^1920945 is an apocalyptic number.

1920945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1920945 is a deficient number, since it is larger than the sum of its proper divisors (1389327).

1920945 is a wasteful number, since it uses less digits than its factorization.

1920945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9872.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1920945 is about 1385.9816016095. The cubic root of 1920945 is about 124.3096881070.

The spelling of 1920945 in words is "one million, nine hundred twenty thousand, nine hundred forty-five".