393968797 has 4 divisors (see below), whose sum is σ = 396169920. Its totient is φ = 391767676.

The previous prime is 393968791. The next prime is 393968807. The reversal of 393968797 is 797869393.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 797869393 = 4423 ⋅180391.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-393968797 is a prime.

It is a super-2 number, since 2×393968797² = 310422826019254418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (393968791) 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, 1100293 + ... + 1100650.

It is an arithmetic number, because the mean of its divisors is an integer number (99042480).

Almost surely, 2^393968797 is an apocalyptic number.

It is an amenable number.

393968797 is a deficient number, since it is larger than the sum of its proper divisors (2201123).

393968797 is a wasteful number, since it uses less digits than its factorization.

393968797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201122.

The product of its digits is 15431472, while the sum is 61.

The square root of 393968797 is about 19848.6472335018. The cubic root of 393968797 is about 733.0843396865.

The spelling of 393968797 in words is "three hundred ninety-three million, nine hundred sixty-eight thousand, seven hundred ninety-seven".