1278831 has 16 divisors (see below), whose sum is σ = 1800288. Its totient is φ = 806400.

The previous prime is 1278817. The next prime is 1278839. The reversal of 1278831 is 1388721.

It is a happy number.

It is not a de Polignac number, because 1278831 - 2⁵ = 1278799 is a prime.

It is a super-2 number, since 2×1278831² = 3270817453122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4411 + ... + 4691.

It is an arithmetic number, because the mean of its divisors is an integer number (112518).

2^1278831 is an apocalyptic number.

1278831 is a deficient number, since it is larger than the sum of its proper divisors (521457).

1278831 is a wasteful number, since it uses less digits than its factorization.

1278831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362.

The product of its digits is 2688, while the sum is 30.

The square root of 1278831 is about 1130.8541019955. The cubic root of 1278831 is about 108.5436409067.

The spelling of 1278831 in words is "one million, two hundred seventy-eight thousand, eight hundred thirty-one".