1920399 has 16 divisors (see below), whose sum is σ = 2827104. Its totient is φ = 1152000.

The previous prime is 1920397. The next prime is 1920403. The reversal of 1920399 is 9930291.

It is not a de Polignac number, because 1920399 - 2¹ = 1920397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1920397) 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 15 ways as a sum of consecutive naturals, for example, 999 + ... + 2199.

It is an arithmetic number, because the mean of its divisors is an integer number (176694).

2^1920399 is an apocalyptic number.

1920399 is a deficient number, since it is larger than the sum of its proper divisors (906705).

1920399 is a wasteful number, since it uses less digits than its factorization.

1920399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258.

The product of its (nonzero) digits is 4374, while the sum is 33.

The square root of 1920399 is about 1385.7846152992. The cubic root of 1920399 is about 124.2979092652.

The spelling of 1920399 in words is "one million, nine hundred twenty thousand, three hundred ninety-nine".