393418889 has 2 divisors, whose sum is σ = 393418890. Its totient is φ = 393418888.

The previous prime is 393418847. The next prime is 393418897. The reversal of 393418889 is 988814393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353628025 + 39790864 = 18805^2 + 6308^2 .

It is a cyclic number.

It is not a de Polignac number, because 393418889 - 2⁸ = 393418633 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 393418889.

It is not a weakly prime, because it can be changed into another prime (393418819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196709444 + 196709445.

It is an arithmetic number, because the mean of its divisors is an integer number (196709445).

Almost surely, 2^393418889 is an apocalyptic number.

It is an amenable number.

393418889 is a deficient number, since it is larger than the sum of its proper divisors (1).

393418889 is an equidigital number, since it uses as much as digits as its factorization.

393418889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 53.

The square root of 393418889 is about 19834.7898652847. The cubic root of 393418889 is about 732.7430972190.

The spelling of 393418889 in words is "three hundred ninety-three million, four hundred eighteen thousand, eight hundred eighty-nine".