1920243 has 16 divisors (see below), whose sum is σ = 2812320. Its totient is φ = 1158144.

The previous prime is 1920239. The next prime is 1920257. The reversal of 1920243 is 3420291.

It is not a de Polignac number, because 1920243 - 2² = 1920239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1920203) 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, 1603 + ... + 2531.

It is an arithmetic number, because the mean of its divisors is an integer number (175770).

2^1920243 is an apocalyptic number.

1920243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1920243 is a deficient number, since it is larger than the sum of its proper divisors (892077).

1920243 is a wasteful number, since it uses less digits than its factorization.

1920243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 1920243 is about 1385.7283283530. The cubic root of 1920243 is about 124.2945434718.

The spelling of 1920243 in words is "one million, nine hundred twenty thousand, two hundred forty-three".