393240697 has 2 divisors, whose sum is σ = 393240698. Its totient is φ = 393240696.

The previous prime is 393240689. The next prime is 393240703. The reversal of 393240697 is 796042393.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 355737321 + 37503376 = 18861^2 + 6124^2 .

It is an emirp because it is prime and its reverse (796042393) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 393240697 - 2³ = 393240689 is a prime.

It is equal to p_20994829 and since 393240697 and 20994829 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (393240097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196620348 + 196620349.

It is an arithmetic number, because the mean of its divisors is an integer number (196620349).

Almost surely, 2^393240697 is an apocalyptic number.

It is an amenable number.

393240697 is a deficient number, since it is larger than the sum of its proper divisors (1).

393240697 is an equidigital number, since it uses as much as digits as its factorization.

393240697 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 43.

The square root of 393240697 is about 19830.2974511226. The cubic root of 393240697 is about 732.6324529163.

The spelling of 393240697 in words is "three hundred ninety-three million, two hundred forty thousand, six hundred ninety-seven".