393931290097 has 4 divisors (see below), whose sum is σ = 397545338740. Its totient is φ = 390317241456.

The previous prime is 393931290089. The next prime is 393931290113. The reversal of 393931290097 is 790092139393.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 790092139393 = 2203 ⋅358643731.

It can be written as a sum of positive squares in 2 ways, for example, as 181660078656 + 212271211441 = 426216^2 + 460729^2 .

It is a cyclic number.

It is not a de Polignac number, because 393931290097 - 2³ = 393931290089 is a prime.

It is a super-2 number, since 2×393931290097² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (393931290997) 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, 1807024158 + ... + 1807024375.

It is an arithmetic number, because the mean of its divisors is an integer number (99386334685).

Almost surely, 2^393931290097 is an apocalyptic number.

It is an amenable number.

393931290097 is a deficient number, since it is larger than the sum of its proper divisors (3614048643).

393931290097 is a wasteful number, since it uses less digits than its factorization.

393931290097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614048642.

The product of its (nonzero) digits is 2480058, while the sum is 55.

The spelling of 393931290097 in words is "three hundred ninety-three billion, nine hundred thirty-one million, two hundred ninety thousand, ninety-seven".