2194078 has 4 divisors (see below), whose sum is σ = 3291120.
Its totient is φ = 1097038.
The previous prime is 2194069. The next prime is 2194133. The reversal of 2194078 is 8704912.
It is a semiprime because it is the product of two primes.
It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a congruent number.
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 548518 + ... + 548521.
It is an arithmetic number, because the mean of its divisors is an integer number (822780).
22194078 is an apocalyptic number.
2194078 is a deficient number, since it is larger than the sum of its proper divisors (1097042).
2194078 is a wasteful number, since it uses less digits than its factorization.
2194078 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1097041.
The product of its (nonzero) digits is 4032, while the sum is 31.
The square root of 2194078 is about 1481.2420463921.
The cubic root of 2194078 is about 129.9423412944.
The spelling of 2194078 in words is "two million, one hundred ninety-four thousand, seventy-eight".