1229278 has 4 divisors (see below), whose sum is σ = 1843920. Its totient is φ = 614638.

The previous prime is 1229273. The next prime is 1229279. The reversal of 1229278 is 8729221.

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

It is a super-2 number, since 2×1229278² = 3022248802568, which contains 22 as substring.

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 (1229273) 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, 307318 + ... + 307321.

It is an arithmetic number, because the mean of its divisors is an integer number (460980).

2^1229278 is an apocalyptic number.

1229278 is a deficient number, since it is larger than the sum of its proper divisors (614642).

1229278 is an equidigital number, since it uses as much as digits as its factorization.

1229278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614641.

The product of its digits is 4032, while the sum is 31.

The square root of 1229278 is about 1108.7281001219. The cubic root of 1229278 is about 107.1231586220.

The spelling of 1229278 in words is "one million, two hundred twenty-nine thousand, two hundred seventy-eight".