1222378 has 4 divisors (see below), whose sum is σ = 1833570. Its totient is φ = 611188.

The previous prime is 1222373. The next prime is 1222393. The reversal of 1222378 is 8732221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8732221 = 41 ⋅212981.

It can be written as a sum of positive squares in only one way, i.e., 1108809 + 113569 = 1053^2 + 337^2 .

It is a plaindrome in base 10.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (1222373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305593 + ... + 305596.

2^1222378 is an apocalyptic number.

1222378 is a deficient number, since it is larger than the sum of its proper divisors (611192).

1222378 is an equidigital number, since it uses as much as digits as its factorization.

1222378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611191.

The product of its digits is 1344, while the sum is 25.

The square root of 1222378 is about 1105.6120476912. The cubic root of 1222378 is about 106.9223531939.

Adding to 1222378 its reverse (8732221), we get a palindrome (9954599).

It can be divided in two parts, 1222 and 378, that added together give a square (1600 = 40²).

The spelling of 1222378 in words is "one million, two hundred twenty-two thousand, three hundred seventy-eight".