1393690457 has 2 divisors, whose sum is σ = 1393690458. Its totient is φ = 1393690456.

The previous prime is 1393690393. The next prime is 1393690511. The reversal of 1393690457 is 7540963931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1076102416 + 317588041 = 32804^2 + 17821^2 .

It is a cyclic number.

It is not a de Polignac number, because 1393690457 - 2⁶ = 1393690393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1393690057) 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, 696845228 + 696845229.

It is an arithmetic number, because the mean of its divisors is an integer number (696845229).

Almost surely, 2^1393690457 is an apocalyptic number.

It is an amenable number.

1393690457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393690457 is an equidigital number, since it uses as much as digits as its factorization.

1393690457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 612360, while the sum is 47.

The square root of 1393690457 is about 37332.1638403134. The cubic root of 1393690457 is about 1117.0058358255.

The spelling of 1393690457 in words is "one billion, three hundred ninety-three million, six hundred ninety thousand, four hundred fifty-seven".