2102978 has 16 divisors (see below), whose sum is σ = 3297024. Its totient is φ = 1004880.

The previous prime is 2102941. The next prime is 2102999. The reversal of 2102978 is 8792012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2102978.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6476 + ... + 6792.

It is an arithmetic number, because the mean of its divisors is an integer number (206064).

2^2102978 is an apocalyptic number.

2102978 is a deficient number, since it is larger than the sum of its proper divisors (1194046).

2102978 is a wasteful number, since it uses less digits than its factorization.

2102978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 2102978 is about 1450.1648182189. The cubic root of 2102978 is about 128.1184206814.

The spelling of 2102978 in words is "two million, one hundred two thousand, nine hundred seventy-eight".