1630978343 has 2 divisors, whose sum is σ = 1630978344. Its totient is φ = 1630978342.

The previous prime is 1630978339. The next prime is 1630978361. The reversal of 1630978343 is 3438790361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1630978343 - 2² = 1630978339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1630978294 and 1630978303.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1630978243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815489171 + 815489172.

It is an arithmetic number, because the mean of its divisors is an integer number (815489172).

Almost surely, 2^1630978343 is an apocalyptic number.

1630978343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630978343 is an equidigital number, since it uses as much as digits as its factorization.

1630978343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 1630978343 is about 40385.3728842511. The cubic root of 1630978343 is about 1177.1073317412.

The spelling of 1630978343 in words is "one billion, six hundred thirty million, nine hundred seventy-eight thousand, three hundred forty-three".