8121895 has 8 divisors (see below), whose sum is σ = 9984240. Its totient is φ = 6338880.

The previous prime is 8121889. The next prime is 8121901. The reversal of 8121895 is 5981218.

It is an interprime number because it is at equal distance from previous prime (8121889) and next prime (8121901).

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

It is not a de Polignac number, because 8121895 - 2³ = 8121887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8121895.

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, 19605 + ... + 20014.

It is an arithmetic number, because the mean of its divisors is an integer number (1248030).

Almost surely, 2^8121895 is an apocalyptic number.

8121895 is a deficient number, since it is larger than the sum of its proper divisors (1862345).

8121895 is a wasteful number, since it uses less digits than its factorization.

8121895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39665.

The product of its digits is 5760, while the sum is 34.

The square root of 8121895 is about 2849.8938576726. The cubic root of 8121895 is about 201.0106757364.

The spelling of 8121895 in words is "eight million, one hundred twenty-one thousand, eight hundred ninety-five".