2190078 has 40 divisors (see below), whose sum is σ = 5357880. Its totient is φ = 663120.

The previous prime is 2190077. The next prime is 2190079. The reversal of 2190078 is 8700912.

It is an interprime number because it is at equal distance from previous prime (2190077) and next prime (2190079).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190077) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 1168 + ... + 2396.

It is an arithmetic number, because the mean of its divisors is an integer number (133947).

2^2190078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2190078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2678940).

2190078 is an abundant number, since it is smaller than the sum of its proper divisors (3167802).

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

2190078 is a wasteful number, since it uses less digits than its factorization.

2190078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254 (or 1245 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 2190078 is about 1479.8912122180. The cubic root of 2190078 is about 129.8633277638.

The spelling of 2190078 in words is "two million, one hundred ninety thousand, seventy-eight".