3891215 has 8 divisors (see below), whose sum is σ = 4944240. Its totient is φ = 2929792.

The previous prime is 3891203. The next prime is 3891229. The reversal of 3891215 is 5121983.

3891215 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 3891215 - 2¹⁰ = 3890191 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22805 + ... + 22974.

It is an arithmetic number, because the mean of its divisors is an integer number (618030).

Almost surely, 2^3891215 is an apocalyptic number.

3891215 is a deficient number, since it is larger than the sum of its proper divisors (1053025).

3891215 is a wasteful number, since it uses less digits than its factorization.

3891215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45801.

The product of its digits is 2160, while the sum is 29.

The square root of 3891215 is about 1972.6162830110. The cubic root of 3891215 is about 157.2878137052.

The spelling of 3891215 in words is "three million, eight hundred ninety-one thousand, two hundred fifteen".