1820378 has 8 divisors (see below), whose sum is σ = 3120672. Its totient is φ = 780156.

The previous prime is 1820353. The next prime is 1820387. The reversal of 1820378 is 8730281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1820378.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 65000 + ... + 65027.

It is an arithmetic number, because the mean of its divisors is an integer number (390084).

2^1820378 is an apocalyptic number.

1820378 is a deficient number, since it is larger than the sum of its proper divisors (1300294).

1820378 is a wasteful number, since it uses less digits than its factorization.

1820378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130036.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 1820378 is about 1349.2138451706. The cubic root of 1820378 is about 122.1013669760.

Subtracting 1820378 from its reverse (8730281), we obtain a triangular number (6909903 = T₃₇₁₇).

It can be divided in two parts, 18203 and 78, that added together give a palindrome (18281).

The spelling of 1820378 in words is "one million, eight hundred twenty thousand, three hundred seventy-eight".