393845261 has 12 divisors (see below), whose sum is σ = 412792380. Its totient is φ = 375735360.

The previous prime is 393845251. The next prime is 393845269. The reversal of 393845261 is 162548393.

It can be written as a sum of positive squares in 2 ways, for example, as 63696361 + 330148900 = 7981^2 + 18170^2 .

It is not a de Polignac number, because 393845261 - 2⁶ = 393845197 is a prime.

It is a super-2 number, since 2×393845261² = 310228179224316242, 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 (393845269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 274895 + ... + 276323.

It is an arithmetic number, because the mean of its divisors is an integer number (34399365).

Almost surely, 2^393845261 is an apocalyptic number.

It is an amenable number.

393845261 is a deficient number, since it is larger than the sum of its proper divisors (18947119).

393845261 is a wasteful number, since it uses less digits than its factorization.

393845261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1996 (or 1973 counting only the distinct ones).

The product of its digits is 155520, while the sum is 41.

The square root of 393845261 is about 19845.5350393987. The cubic root of 393845261 is about 733.0077077509.

The spelling of 393845261 in words is "three hundred ninety-three million, eight hundred forty-five thousand, two hundred sixty-one".