3881815 has 8 divisors (see below), whose sum is σ = 5323680. Its totient is φ = 2661792.

The previous prime is 3881807. The next prime is 3881837. The reversal of 3881815 is 5181883.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3881815 - 2³ = 3881807 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55420 + ... + 55489.

It is an arithmetic number, because the mean of its divisors is an integer number (665460).

Almost surely, 2^3881815 is an apocalyptic number.

3881815 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3881815 is a deficient number, since it is larger than the sum of its proper divisors (1441865).

3881815 is a wasteful number, since it uses less digits than its factorization.

3881815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110921.

The product of its digits is 7680, while the sum is 34.

The square root of 3881815 is about 1970.2322198157. The cubic root of 3881815 is about 157.1610583010.

The spelling of 3881815 in words is "three million, eight hundred eighty-one thousand, eight hundred fifteen".