1378822 has 4 divisors (see below), whose sum is σ = 2068236. Its totient is φ = 689410.

The previous prime is 1378813. The next prime is 1378823. The reversal of 1378822 is 2288731.

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 not an unprimeable number, because it can be changed into a prime (1378823) 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, 344704 + ... + 344707.

It is an arithmetic number, because the mean of its divisors is an integer number (517059).

2^1378822 is an apocalyptic number.

1378822 is a deficient number, since it is larger than the sum of its proper divisors (689414).

1378822 is an equidigital number, since it uses as much as digits as its factorization.

1378822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689413.

The product of its digits is 5376, while the sum is 31.

The square root of 1378822 is about 1174.2325153052. The cubic root of 1378822 is about 111.3019401450.

Subtracting 1378822 from its reverse (2288731), we obtain a palindrome (909909).

The spelling of 1378822 in words is "one million, three hundred seventy-eight thousand, eight hundred twenty-two".