1393690393 has 2 divisors, whose sum is σ = 1393690394. Its totient is φ = 1393690392.

The previous prime is 1393690367. The next prime is 1393690457. The reversal of 1393690393 is 3930963931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1117698624 + 275991769 = 33432^2 + 16613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1393690393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1393690693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696845196 + 696845197.

It is an arithmetic number, because the mean of its divisors is an integer number (696845197).

Almost surely, 2^1393690393 is an apocalyptic number.

It is an amenable number.

1393690393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393690393 is an equidigital number, since it uses as much as digits as its factorization.

1393690393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 354294, while the sum is 46.

The square root of 1393690393 is about 37332.1629831436. The cubic root of 1393690393 is about 1117.0058187274.

It can be divided in two parts, 13936 and 90393, that added together give a square (104329 = 323²).

The spelling of 1393690393 in words is "one billion, three hundred ninety-three million, six hundred ninety thousand, three hundred ninety-three".