1279440 has 60 divisors (see below), whose sum is σ = 4299204. Its totient is φ = 340992.

The previous prime is 1279427. The next prime is 1279457. The reversal of 1279440 is 449721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 553536 + 725904 = 744^2 + 852^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 169 + ... + 1608.

2^1279440 is an apocalyptic number.

1279440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1279440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2149602).

1279440 is an abundant number, since it is smaller than the sum of its proper divisors (3019764).

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

1279440 is a wasteful number, since it uses less digits than its factorization.

1279440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796 (or 1787 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1279440 is about 1131.1233354502. The cubic root of 1279440 is about 108.5608682513.

The spelling of 1279440 in words is "one million, two hundred seventy-nine thousand, four hundred forty".