381947872385 has 16 divisors (see below), whose sum is σ = 491145451776. Its totient is φ = 284119404288.

The previous prime is 381947872373. The next prime is 381947872409. The reversal of 381947872385 is 583278749183.

It is a cyclic number.

It is not a de Polignac number, because 381947872385 - 2¹⁸ = 381947610241 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27062249 + ... + 27076358.

It is an arithmetic number, because the mean of its divisors is an integer number (30696590736).

Almost surely, 2^381947872385 is an apocalyptic number.

It is an amenable number.

381947872385 is a deficient number, since it is larger than the sum of its proper divisors (109197579391).

381947872385 is a wasteful number, since it uses less digits than its factorization.

381947872385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54138712.

The product of its digits is 81285120, while the sum is 65.

The spelling of 381947872385 in words is "three hundred eighty-one billion, nine hundred forty-seven million, eight hundred seventy-two thousand, three hundred eighty-five".