1978343 has 2 divisors, whose sum is σ = 1978344. Its totient is φ = 1978342.

The previous prime is 1978313. The next prime is 1978349. The reversal of 1978343 is 3438791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1978343 - 2⁸ = 1978087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1978349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989171 + 989172.

It is an arithmetic number, because the mean of its divisors is an integer number (989172).

2^1978343 is an apocalyptic number.

1978343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978343 is an equidigital number, since it uses as much as digits as its factorization.

1978343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 35.

The square root of 1978343 is about 1406.5358153990. The cubic root of 1978343 is about 125.5356850528.

The spelling of 1978343 in words is "one million, nine hundred seventy-eight thousand, three hundred forty-three".