381308865 has 64 divisors (see below), whose sum is σ = 728286720. Its totient is φ = 166717440.

The previous prime is 381308833. The next prime is 381308867. The reversal of 381308865 is 568803183.

It is not a de Polignac number, because 381308865 - 2⁵ = 381308833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (381308867) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 236181 + ... + 237789.

It is an arithmetic number, because the mean of its divisors is an integer number (11379480).

Almost surely, 2^381308865 is an apocalyptic number.

381308865 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

381308865 is a deficient number, since it is larger than the sum of its proper divisors (346977855).

381308865 is a wasteful number, since it uses less digits than its factorization.

381308865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1722.

The product of its (nonzero) digits is 138240, while the sum is 42.

The square root of 381308865 is about 19527.1315097738. The cubic root of 381308865 is about 725.1462978646.

The spelling of 381308865 in words is "three hundred eighty-one million, three hundred eight thousand, eight hundred sixty-five".