1309040 has 20 divisors (see below), whose sum is σ = 3043704. Its totient is φ = 523584.

The previous prime is 1309039. The next prime is 1309057. The reversal of 1309040 is 409031.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8102 + ... + 8261.

2^1309040 is an apocalyptic number.

1309040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1309040 is an abundant number, since it is smaller than the sum of its proper divisors (1734664).

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

1309040 is a wasteful number, since it uses less digits than its factorization.

1309040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16376 (or 16370 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1309040 is about 1144.1328594180. The cubic root of 1309040 is about 109.3916834415.

Subtracting from 1309040 its reverse (409031), we obtain a palindrome (900009).

The spelling of 1309040 in words is "one million, three hundred nine thousand, forty".