1278428 has 6 divisors (see below), whose sum is σ = 2237256. Its totient is φ = 639212.

The previous prime is 1278419. The next prime is 1278437. The reversal of 1278428 is 8248721.

It is an interprime number because it is at equal distance from previous prime (1278419) and next prime (1278437).

It is a junction number, because it is equal to n+sod(n) for n = 1278394 and 1278403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159800 + ... + 159807.

It is an arithmetic number, because the mean of its divisors is an integer number (372876).

2^1278428 is an apocalyptic number.

It is an amenable number.

1278428 is a deficient number, since it is larger than the sum of its proper divisors (958828).

1278428 is a wasteful number, since it uses less digits than its factorization.

1278428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319611 (or 319609 counting only the distinct ones).

The product of its digits is 7168, while the sum is 32.

The square root of 1278428 is about 1130.6759040503. The cubic root of 1278428 is about 108.5322378668.

The spelling of 1278428 in words is "one million, two hundred seventy-eight thousand, four hundred twenty-eight".