393346861 has 4 divisors (see below), whose sum is σ = 393392572. Its totient is φ = 393301152.

The previous prime is 393346831. The next prime is 393346903. The reversal of 393346861 is 168643393.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 168643393 = 2707 ⋅62299.

It can be written as a sum of positive squares in 2 ways, for example, as 295633636 + 97713225 = 17194^2 + 9885^2 .

It is a cyclic number.

It is not a de Polignac number, because 393346861 - 2¹³ = 393338669 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 (393346831) 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, 5610 + ... + 28603.

It is an arithmetic number, because the mean of its divisors is an integer number (98348143).

Almost surely, 2^393346861 is an apocalyptic number.

It is an amenable number.

393346861 is a deficient number, since it is larger than the sum of its proper divisors (45711).

393346861 is a wasteful number, since it uses less digits than its factorization.

393346861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45710.

The product of its digits is 279936, while the sum is 43.

The square root of 393346861 is about 19832.9740835811. The cubic root of 393346861 is about 732.6983770810.

The spelling of 393346861 in words is "three hundred ninety-three million, three hundred forty-six thousand, eight hundred sixty-one".