2978155 has 32 divisors (see below), whose sum is σ = 4147200. Its totient is φ = 2040192.

The previous prime is 2978147. The next prime is 2978161. The reversal of 2978155 is 5518792.

It is not a de Polignac number, because 2978155 - 2³ = 2978147 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 (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63342 + ... + 63388.

It is an arithmetic number, because the mean of its divisors is an integer number (129600).

2^2978155 is an apocalyptic number.

2978155 is a deficient number, since it is larger than the sum of its proper divisors (1169045).

2978155 is a wasteful number, since it uses less digits than its factorization.

2978155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123.

The product of its digits is 25200, while the sum is 37.

The square root of 2978155 is about 1725.7331775219. The cubic root of 2978155 is about 143.8740378679.

The spelling of 2978155 in words is "two million, nine hundred seventy-eight thousand, one hundred fifty-five".