1309940 has 12 divisors (see below), whose sum is σ = 2750916. Its totient is φ = 523968.

The previous prime is 1309939. The next prime is 1309949. The reversal of 1309940 is 499031.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 556516 + 753424 = 746^2 + 868^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32729 + ... + 32768.

It is an arithmetic number, because the mean of its divisors is an integer number (229243).

2^1309940 is an apocalyptic number.

1309940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1309940 is an abundant number, since it is smaller than the sum of its proper divisors (1440976).

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

1309940 is a wasteful number, since it uses less digits than its factorization.

1309940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65506 (or 65504 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1309940 is about 1144.5261028041. The cubic root of 1309940 is about 109.4167476006.

The spelling of 1309940 in words is "one million, three hundred nine thousand, nine hundred forty".