1278431 has 8 divisors (see below), whose sum is σ = 1593984. Its totient is φ = 996120.

The previous prime is 1278419. The next prime is 1278437. The reversal of 1278431 is 1348721.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1278431 is a prime.

It is a super-2 number, since 2×1278431² = 3268771643522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1278431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8225 + ... + 8378.

It is an arithmetic number, because the mean of its divisors is an integer number (199248).

2^1278431 is an apocalyptic number.

1278431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1278431 is a deficient number, since it is larger than the sum of its proper divisors (315553).

1278431 is a wasteful number, since it uses less digits than its factorization.

1278431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16621.

The product of its digits is 1344, while the sum is 26.

The square root of 1278431 is about 1130.6772306896. The cubic root of 1278431 is about 108.5323227618.

It can be divided in two parts, 127 and 8431, that added together give a palindrome (8558).

The spelling of 1278431 in words is "one million, two hundred seventy-eight thousand, four hundred thirty-one".