1278089 has 4 divisors (see below), whose sum is σ = 1307856. Its totient is φ = 1248324.

The previous prime is 1278047. The next prime is 1278097. The reversal of 1278089 is 9808721.

1278089 = T₂₂₂ + T₂₂₃ + ... + T₂₆₄.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1278089 - 2⁸ = 1277833 is a prime.

It is a super-2 number, since 2×1278089² = 3267022983842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1278029) 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 in 3 ways as a sum of consecutive naturals, for example, 14819 + ... + 14904.

It is an arithmetic number, because the mean of its divisors is an integer number (326964).

2^1278089 is an apocalyptic number.

It is an amenable number.

1278089 is a deficient number, since it is larger than the sum of its proper divisors (29767).

1278089 is an equidigital number, since it uses as much as digits as its factorization.

1278089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29766.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1278089 is about 1130.5259837792. The cubic root of 1278089 is about 108.5226438755.

The spelling of 1278089 in words is "one million, two hundred seventy-eight thousand, eighty-nine".