381907865 has 16 divisors (see below), whose sum is σ = 462144000. Its totient is φ = 302968512.

The previous prime is 381907861. The next prime is 381907871. The reversal of 381907865 is 568709183.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 381907865 - 2² = 381907861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381907861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 460271 + ... + 461099.

It is an arithmetic number, because the mean of its divisors is an integer number (28884000).

Almost surely, 2^381907865 is an apocalyptic number.

It is an amenable number.

381907865 is a deficient number, since it is larger than the sum of its proper divisors (80236135).

381907865 is a wasteful number, since it uses less digits than its factorization.

381907865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1496.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 381907865 is about 19542.4631252051. The cubic root of 381907865 is about 725.5258111875.

The spelling of 381907865 in words is "three hundred eighty-one million, nine hundred seven thousand, eight hundred sixty-five".