394531648493 has 4 divisors (see below), whose sum is σ = 417739392540. Its totient is φ = 371323904448.

The previous prime is 394531648481. The next prime is 394531648513. The reversal of 394531648493 is 394846135493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 394846135493 = 107 ⋅3690150799.

It can be written as a sum of positive squares in 2 ways, for example, as 340259889124 + 54271759369 = 583318^2 + 232963^2 .

It is a cyclic number.

It is not a de Polignac number, because 394531648493 - 2⁴ = 394531648477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394531638493) 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, 11603871998 + ... + 11603872031.

It is an arithmetic number, because the mean of its divisors is an integer number (104434848135).

Almost surely, 2^394531648493 is an apocalyptic number.

It is an amenable number.

394531648493 is a deficient number, since it is larger than the sum of its proper divisors (23207744047).

394531648493 is a wasteful number, since it uses less digits than its factorization.

394531648493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23207744046.

The product of its digits is 33592320, while the sum is 59.

The spelling of 394531648493 in words is "three hundred ninety-four billion, five hundred thirty-one million, six hundred forty-eight thousand, four hundred ninety-three".