1993400329 has 2 divisors, whose sum is σ = 1993400330. Its totient is φ = 1993400328.

The previous prime is 1993400261. The next prime is 1993400351. The reversal of 1993400329 is 9230043991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1960452729 + 32947600 = 44277^2 + 5740^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1993400329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1993400291 and 1993400300.

It is not a weakly prime, because it can be changed into another prime (1993400359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 996700164 + 996700165.

It is an arithmetic number, because the mean of its divisors is an integer number (996700165).

Almost surely, 2^1993400329 is an apocalyptic number.

It is an amenable number.

1993400329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1993400329 is an equidigital number, since it uses as much as digits as its factorization.

1993400329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 1993400329 is about 44647.5120135490. The cubic root of 1993400329 is about 1258.5336786725.

The spelling of 1993400329 in words is "one billion, nine hundred ninety-three million, four hundred thousand, three hundred twenty-nine".