1278624 has 48 divisors (see below), whose sum is σ = 3538080. Its totient is φ = 403200.

The previous prime is 1278623. The next prime is 1278631. The reversal of 1278624 is 4268721.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 1278591 and 1278600.

It is not an unprimeable number, because it can be changed into a prime (1278623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1474 + ... + 2174.

It is an arithmetic number, because the mean of its divisors is an integer number (73710).

2^1278624 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278624, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1769040).

1278624 is an abundant number, since it is smaller than the sum of its proper divisors (2259456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278624 is a wasteful number, since it uses less digits than its factorization.

1278624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733 (or 725 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 1278624 is about 1130.7625745487. The cubic root of 1278624 is about 108.5377840614.

The spelling of 1278624 in words is "one million, two hundred seventy-eight thousand, six hundred twenty-four".