1278158 has 8 divisors (see below), whose sum is σ = 2191152. Its totient is φ = 547776.

The previous prime is 1278139. The next prime is 1278163. The reversal of 1278158 is 8518721.

It is a happy number.

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

It is a super-3 number, since 3×1278158³ = 6264333672995760936, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45635 + ... + 45662.

It is an arithmetic number, because the mean of its divisors is an integer number (273894).

2^1278158 is an apocalyptic number.

1278158 is a deficient number, since it is larger than the sum of its proper divisors (912994).

1278158 is an equidigital number, since it uses as much as digits as its factorization.

1278158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91306.

The product of its digits is 4480, while the sum is 32.

The square root of 1278158 is about 1130.5565001361. The cubic root of 1278158 is about 108.5245967723.

The spelling of 1278158 in words is "one million, two hundred seventy-eight thousand, one hundred fifty-eight".