1288398 has 8 divisors (see below), whose sum is σ = 2576808. Its totient is φ = 429464.

The previous prime is 1288393. The next prime is 1288421. The reversal of 1288398 is 8938821.

It is a sphenic number, since it is the product of 3 distinct primes.

1288398 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1288393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107361 + ... + 107372.

It is an arithmetic number, because the mean of its divisors is an integer number (322101).

2^1288398 is an apocalyptic number.

1288398 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1288398 is a wasteful number, since it uses less digits than its factorization.

1288398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214738.

The product of its digits is 27648, while the sum is 39.

The square root of 1288398 is about 1135.0762088952. The cubic root of 1288398 is about 108.8136422304.

It can be divided in two parts, 12 and 88398, that added together give a triangular number (88410 = T₄₂₀).

The spelling of 1288398 in words is "one million, two hundred eighty-eight thousand, three hundred ninety-eight".