393135689 has 2 divisors, whose sum is σ = 393135690. Its totient is φ = 393135688.

The previous prime is 393135671. The next prime is 393135697. The reversal of 393135689 is 986531393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 362521600 + 30614089 = 19040^2 + 5533^2 .

It is a cyclic number.

It is not a de Polignac number, because 393135689 - 2¹² = 393131593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (393135649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196567844 + 196567845.

It is an arithmetic number, because the mean of its divisors is an integer number (196567845).

Almost surely, 2^393135689 is an apocalyptic number.

It is an amenable number.

393135689 is a deficient number, since it is larger than the sum of its proper divisors (1).

393135689 is an equidigital number, since it uses as much as digits as its factorization.

393135689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 47.

The square root of 393135689 is about 19827.6496085643. The cubic root of 393135689 is about 732.5672349145.

The spelling of 393135689 in words is "three hundred ninety-three million, one hundred thirty-five thousand, six hundred eighty-nine".