2189378 has 4 divisors (see below), whose sum is σ = 3284070. Its totient is φ = 1094688.

The previous prime is 2189371. The next prime is 2189381. The reversal of 2189378 is 8739812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1570009 + 619369 = 1253^2 + 787^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2189371) by changing a digit.

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 as a sum of consecutive naturals, namely, 547343 + ... + 547346.

2^2189378 is an apocalyptic number.

2189378 is a deficient number, since it is larger than the sum of its proper divisors (1094692).

2189378 is a wasteful number, since it uses less digits than its factorization.

2189378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094691.

The product of its digits is 24192, while the sum is 38.

The square root of 2189378 is about 1479.6546894462. The cubic root of 2189378 is about 129.8494905069.

The spelling of 2189378 in words is "two million, one hundred eighty-nine thousand, three hundred seventy-eight".