1209040 has 80 divisors (see below), whose sum is σ = 3428352. Its totient is φ = 387072.

The previous prime is 1209029. The next prime is 1209053. The reversal of 1209040 is 409021.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9457 + ... + 9583.

2^1209040 is an apocalyptic number.

1209040 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 1209040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1714176).

1209040 is an abundant number, since it is smaller than the sum of its proper divisors (2219312).

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

1209040 is a wasteful number, since it uses less digits than its factorization.

1209040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1209040 is about 1099.5635497778. The cubic root of 1209040 is about 106.5320350043.

The spelling of 1209040 in words is "one million, two hundred nine thousand, forty".