1289240 has 32 divisors (see below), whose sum is σ = 2933280. Its totient is φ = 509952.

The previous prime is 1289237. The next prime is 1289261. The reversal of 1289240 is 429821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6584 + ... + 6776.

It is an arithmetic number, because the mean of its divisors is an integer number (91665).

2^1289240 is an apocalyptic number.

1289240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1289240 is an abundant number, since it is smaller than the sum of its proper divisors (1644040).

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

1289240 is a wasteful number, since it uses less digits than its factorization.

1289240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 367 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1289240 is about 1135.4470485232. The cubic root of 1289240 is about 108.8373412052.

The spelling of 1289240 in words is "one million, two hundred eighty-nine thousand, two hundred forty".