381808815 has 16 divisors (see below), whose sum is σ = 611184768. Its totient is φ = 203534496.

The previous prime is 381808811. The next prime is 381808837. The reversal of 381808815 is 518808183.

It is not a de Polignac number, because 381808815 - 2² = 381808811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381808811) 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, 35904 + ... + 45306.

It is an arithmetic number, because the mean of its divisors is an integer number (38199048).

Almost surely, 2^381808815 is an apocalyptic number.

381808815 is a deficient number, since it is larger than the sum of its proper divisors (229375953).

381808815 is a wasteful number, since it uses less digits than its factorization.

381808815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12118.

The product of its (nonzero) digits is 61440, while the sum is 42.

The square root of 381808815 is about 19539.9287357964. The cubic root of 381808815 is about 725.4630826677.

The spelling of 381808815 in words is "three hundred eighty-one million, eight hundred eight thousand, eight hundred fifteen".