1978363 has 2 divisors, whose sum is σ = 1978364. Its totient is φ = 1978362.

The previous prime is 1978349. The next prime is 1978393. The reversal of 1978363 is 3638791.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1978363 is a prime.

1978363 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1978313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 989181 + 989182.

It is an arithmetic number, because the mean of its divisors is an integer number (989182).

2^1978363 is an apocalyptic number.

1978363 is a deficient number, since it is larger than the sum of its proper divisors (1).

1978363 is an equidigital number, since it uses as much as digits as its factorization.

1978363 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 1978363 is about 1406.5429250471. The cubic root of 1978363 is about 125.5361080845.

The spelling of 1978363 in words is "one million, nine hundred seventy-eight thousand, three hundred sixty-three".