673400993 has 2 divisors, whose sum is σ = 673400994. Its totient is φ = 673400992.

The previous prime is 673400971. The next prime is 673401011. The reversal of 673400993 is 399004376.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 606292129 + 67108864 = 24623^2 + 8192^2 .

It is a cyclic number.

It is not a de Polignac number, because 673400993 - 2⁸ = 673400737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 673400993.

It is not a weakly prime, because it can be changed into another prime (673400953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336700496 + 336700497.

It is an arithmetic number, because the mean of its divisors is an integer number (336700497).

Almost surely, 2^673400993 is an apocalyptic number.

It is an amenable number.

673400993 is a deficient number, since it is larger than the sum of its proper divisors (1).

673400993 is an equidigital number, since it uses as much as digits as its factorization.

673400993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 41.

The square root of 673400993 is about 25949.9709633749. The cubic root of 673400993 is about 876.5121034421.

The spelling of 673400993 in words is "six hundred seventy-three million, four hundred thousand, nine hundred ninety-three".