393339889 has 2 divisors, whose sum is σ = 393339890. Its totient is φ = 393339888.

The previous prime is 393339887. The next prime is 393339917. The reversal of 393339889 is 988933393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 216237025 + 177102864 = 14705^2 + 13308^2 .

It is a cyclic number.

It is not a de Polignac number, because 393339889 - 2¹ = 393339887 is a prime.

Together with 393339887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (393339883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196669944 + 196669945.

It is an arithmetic number, because the mean of its divisors is an integer number (196669945).

Almost surely, 2^393339889 is an apocalyptic number.

It is an amenable number.

393339889 is a deficient number, since it is larger than the sum of its proper divisors (1).

393339889 is an equidigital number, since it uses as much as digits as its factorization.

393339889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3779136, while the sum is 55.

The square root of 393339889 is about 19832.7983149126. The cubic root of 393339889 is about 732.6940480745.

The spelling of 393339889 in words is "three hundred ninety-three million, three hundred thirty-nine thousand, eight hundred eighty-nine".