393824749 has 2 divisors, whose sum is σ = 393824750. Its totient is φ = 393824748.

The previous prime is 393824747. The next prime is 393824759. The reversal of 393824749 is 947428393.

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., 359367849 + 34456900 = 18957^2 + 5870^2 .

It is a cyclic number.

It is not a de Polignac number, because 393824749 - 2¹ = 393824747 is a prime.

Together with 393824747, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393824741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196912374 + 196912375.

It is an arithmetic number, because the mean of its divisors is an integer number (196912375).

Almost surely, 2^393824749 is an apocalyptic number.

It is an amenable number.

393824749 is a deficient number, since it is larger than the sum of its proper divisors (1).

393824749 is an equidigital number, since it uses as much as digits as its factorization.

393824749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The square root of 393824749 is about 19845.0182413622. The cubic root of 393824749 is about 732.9949821819.

The spelling of 393824749 in words is "three hundred ninety-three million, eight hundred twenty-four thousand, seven hundred forty-nine".