1280918 has 8 divisors (see below), whose sum is σ = 1936440. Its totient is φ = 635440.

The previous prime is 1280887. The next prime is 1280921. The reversal of 1280918 is 8190821.

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

It is a congruent number.

It is an unprimeable number.

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, 2183 + ... + 2706.

It is an arithmetic number, because the mean of its divisors is an integer number (242055).

2^1280918 is an apocalyptic number.

1280918 is a deficient number, since it is larger than the sum of its proper divisors (655522).

1280918 is a wasteful number, since it uses less digits than its factorization.

1280918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5022.

The product of its (nonzero) digits is 1152, while the sum is 29.

The square root of 1280918 is about 1131.7764796991. The cubic root of 1280918 is about 108.6026550795.

Subtracting 1280918 from its reverse (8190821), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 1280918 in words is "one million, two hundred eighty thousand, nine hundred eighteen".