1278416 has 10 divisors (see below), whose sum is σ = 2476962. Its totient is φ = 639200.

The previous prime is 1278401. The next prime is 1278419. The reversal of 1278416 is 6148721.

It can be written as a sum of positive squares in only one way, i.e., 1008016 + 270400 = 1004^2 + 520^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39935 + ... + 39966.

2^1278416 is an apocalyptic number.

1278416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1278416 is a deficient number, since it is larger than the sum of its proper divisors (1198546).

1278416 is an equidigital number, since it uses as much as digits as its factorization.

1278416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79909 (or 79903 counting only the distinct ones).

The product of its digits is 2688, while the sum is 29.

The square root of 1278416 is about 1130.6705974774. The cubic root of 1278416 is about 108.5318982854.

The spelling of 1278416 in words is "one million, two hundred seventy-eight thousand, four hundred sixteen".