1298440 has 64 divisors (see below), whose sum is σ = 3447360. Its totient is φ = 433920.

The previous prime is 1298387. The next prime is 1298467. The reversal of 1298440 is 448921.

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 1298399 and 1298408.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5607 + ... + 5833.

It is an arithmetic number, because the mean of its divisors is an integer number (53865).

2^1298440 is an apocalyptic number.

1298440 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 1298440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1723680).

1298440 is an abundant number, since it is smaller than the sum of its proper divisors (2148920).

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

1298440 is a wasteful number, since it uses less digits than its factorization.

1298440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262 (or 258 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 1298440 is about 1139.4911144893. The cubic root of 1298440 is about 109.0956151169.

The spelling of 1298440 in words is "one million, two hundred ninety-eight thousand, four hundred forty".