391780463 has 2 divisors, whose sum is σ = 391780464. Its totient is φ = 391780462.

The previous prime is 391780447. The next prime is 391780483. The reversal of 391780463 is 364087193.

It is a weak prime.

It is an emirp because it is prime and its reverse (364087193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 391780463 - 2⁴ = 391780447 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 391780463.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391780483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195890231 + 195890232.

It is an arithmetic number, because the mean of its divisors is an integer number (195890232).

Almost surely, 2^391780463 is an apocalyptic number.

391780463 is a deficient number, since it is larger than the sum of its proper divisors (1).

391780463 is an equidigital number, since it uses as much as digits as its factorization.

391780463 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 391780463 is about 19793.4449502859. Note that the first 3 decimals coincide. The cubic root of 391780463 is about 731.7244918319.

The spelling of 391780463 in words is "three hundred ninety-one million, seven hundred eighty thousand, four hundred sixty-three".