393690361 has 2 divisors, whose sum is σ = 393690362. Its totient is φ = 393690360.

The previous prime is 393690337. The next prime is 393690373. The reversal of 393690361 is 163096393.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 340181136 + 53509225 = 18444^2 + 7315^2 .

It is an emirp because it is prime and its reverse (163096393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 393690361 - 2¹⁷ = 393559289 is a prime.

It is not a weakly prime, because it can be changed into another prime (393690061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196845180 + 196845181.

It is an arithmetic number, because the mean of its divisors is an integer number (196845181).

Almost surely, 2^393690361 is an apocalyptic number.

It is an amenable number.

393690361 is a deficient number, since it is larger than the sum of its proper divisors (1).

393690361 is an equidigital number, since it uses as much as digits as its factorization.

393690361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 40.

The square root of 393690361 is about 19841.6320145294. The cubic root of 393690361 is about 732.9115974305.

The spelling of 393690361 in words is "three hundred ninety-three million, six hundred ninety thousand, three hundred sixty-one".