384393240261 has 6 divisors (see below), whose sum is σ = 555234680390. Its totient is φ = 256262160168.

The previous prime is 384393240191. The next prime is 384393240263. The reversal of 384393240261 is 162042393483.

384393240261 is a `hidden beast` number, since 38 + 4 + 39 + 324 + 0 + 261 = 666.

It can be written as a sum of positive squares in only one way, i.e., 285172020225 + 99221220036 = 534015^2 + 314994^2 .

It is not a de Polignac number, because 384393240261 - 2²⁷ = 384259022533 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 (384393240263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21355180006 + ... + 21355180023.

Almost surely, 2^384393240261 is an apocalyptic number.

It is an amenable number.

384393240261 is a deficient number, since it is larger than the sum of its proper divisors (170841440129).

384393240261 is a wasteful number, since it uses less digits than its factorization.

384393240261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42710360035 (or 42710360032 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 45.

The spelling of 384393240261 in words is "three hundred eighty-four billion, three hundred ninety-three million, two hundred forty thousand, two hundred sixty-one".