393672889 has 2 divisors, whose sum is σ = 393672890. Its totient is φ = 393672888.

The previous prime is 393672887. The next prime is 393672907. The reversal of 393672889 is 988276393.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 334890000 + 58782889 = 18300^2 + 7667^2 .

It is a cyclic number.

It is not a de Polignac number, because 393672889 - 2¹ = 393672887 is a prime.

Together with 393672887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (393672887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196836444 + 196836445.

It is an arithmetic number, because the mean of its divisors is an integer number (196836445).

Almost surely, 2^393672889 is an apocalyptic number.

It is an amenable number.

393672889 is a deficient number, since it is larger than the sum of its proper divisors (1).

393672889 is an equidigital number, since it uses as much as digits as its factorization.

393672889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 55.

The square root of 393672889 is about 19841.1917232811. The cubic root of 393672889 is about 732.9007550510.

The spelling of 393672889 in words is "three hundred ninety-three million, six hundred seventy-two thousand, eight hundred eighty-nine".