393961369 has 2 divisors, whose sum is σ = 393961370. Its totient is φ = 393961368.

The previous prime is 393961367. The next prime is 393961429. The reversal of 393961369 is 963169393.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305375625 + 88585744 = 17475^2 + 9412^2 .

It is an emirp because it is prime and its reverse (963169393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 393961369 - 2¹ = 393961367 is a prime.

It is a super-2 number, since 2×393961369² = 310411120528708322, which contains 22 as substring.

Together with 393961367, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (393961367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196980684 + 196980685.

It is an arithmetic number, because the mean of its divisors is an integer number (196980685).

Almost surely, 2^393961369 is an apocalyptic number.

It is an amenable number.

393961369 is a deficient number, since it is larger than the sum of its proper divisors (1).

393961369 is an equidigital number, since it uses as much as digits as its factorization.

393961369 is an evil number, because the sum of its binary digits is even.

The product of its digits is 708588, while the sum is 49.

The square root of 393961369 is about 19848.4601165934. The cubic root of 393961369 is about 733.0797323972.

The spelling of 393961369 in words is "three hundred ninety-three million, nine hundred sixty-one thousand, three hundred sixty-nine".