2100078 has 24 divisors (see below), whose sum is σ = 4818528. Its totient is φ = 658752.

The previous prime is 2100071. The next prime is 2100079. The reversal of 2100078 is 8700012.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 2100078.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3126 + ... + 3737.

It is an arithmetic number, because the mean of its divisors is an integer number (200772).

2^2100078 is an apocalyptic number.

2100078 is an abundant number, since it is smaller than the sum of its proper divisors (2718450).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2100078 is a wasteful number, since it uses less digits than its factorization.

2100078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6888 (or 6885 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 2100078 is about 1449.1645869259. The cubic root of 2100078 is about 128.0595019581.

The spelling of 2100078 in words is "two million, one hundred thousand, seventy-eight".