8378155 has 4 divisors (see below), whose sum is σ = 10053792. Its totient is φ = 6702520.

The previous prime is 8378147. The next prime is 8378171. The reversal of 8378155 is 5518738.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5518738 = 2 ⋅2759369.

It is not a de Polignac number, because 8378155 - 2³ = 8378147 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837811 + ... + 837820.

It is an arithmetic number, because the mean of its divisors is an integer number (2513448).

Almost surely, 2^8378155 is an apocalyptic number.

8378155 is a deficient number, since it is larger than the sum of its proper divisors (1675637).

8378155 is a wasteful number, since it uses less digits than its factorization.

8378155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1675636.

The product of its digits is 33600, while the sum is 37.

The square root of 8378155 is about 2894.5042753466. The cubic root of 8378155 is about 203.1029026849.

The spelling of 8378155 in words is "eight million, three hundred seventy-eight thousand, one hundred fifty-five".