393668497 has 4 divisors (see below), whose sum is σ = 393837876. Its totient is φ = 393499120.

The previous prime is 393668491. The next prime is 393668501. The reversal of 393668497 is 794866393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 794866393 = 167 ⋅4759679.

It can be written as a sum of positive squares in 2 ways, for example, as 78570496 + 315098001 = 8864^2 + 17751^2 .

It is a cyclic number.

It is not a de Polignac number, because 393668497 - 2³ = 393668489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393668491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81154 + ... + 85867.

It is an arithmetic number, because the mean of its divisors is an integer number (98459469).

Almost surely, 2^393668497 is an apocalyptic number.

It is an amenable number.

393668497 is a deficient number, since it is larger than the sum of its proper divisors (169379).

393668497 is a wasteful number, since it uses less digits than its factorization.

393668497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169378.

The product of its digits is 5878656, while the sum is 55.

The square root of 393668497 is about 19841.0810441367. The cubic root of 393668497 is about 732.8980295123.

The spelling of 393668497 in words is "three hundred ninety-three million, six hundred sixty-eight thousand, four hundred ninety-seven".