1678957393 has 2 divisors, whose sum is σ = 1678957394. Its totient is φ = 1678957392.

The previous prime is 1678957367. The next prime is 1678957409. The reversal of 1678957393 is 3937598761.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1547006224 + 131951169 = 39332^2 + 11487^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678957393 - 2¹³ = 1678949201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1678957993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839478696 + 839478697.

It is an arithmetic number, because the mean of its divisors is an integer number (839478697).

Almost surely, 2^1678957393 is an apocalyptic number.

It is an amenable number.

1678957393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678957393 is an equidigital number, since it uses as much as digits as its factorization.

1678957393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8573040, while the sum is 58.

The square root of 1678957393 is about 40975.0825868600. The cubic root of 1678957393 is about 1188.5384200342.

The spelling of 1678957393 in words is "one billion, six hundred seventy-eight million, nine hundred fifty-seven thousand, three hundred ninety-three".