1904942243 has 2 divisors, whose sum is σ = 1904942244. Its totient is φ = 1904942242.

The previous prime is 1904942233. The next prime is 1904942257. The reversal of 1904942243 is 3422494091.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1904942243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1904942197 and 1904942206.

It is not a weakly prime, because it can be changed into another prime (1904942233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 952471121 + 952471122.

It is an arithmetic number, because the mean of its divisors is an integer number (952471122).

Almost surely, 2^1904942243 is an apocalyptic number.

1904942243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1904942243 is an equidigital number, since it uses as much as digits as its factorization.

1904942243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 1904942243 is about 43645.6440323659. The cubic root of 1904942243 is about 1239.6353079013.

The spelling of 1904942243 in words is "one billion, nine hundred four million, nine hundred forty-two thousand, two hundred forty-three".