1340406 has 24 divisors (see below), whose sum is σ = 2934360. Its totient is φ = 442176.

The previous prime is 1340401. The next prime is 1340407. The reversal of 1340406 is 6040431.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1705 + ... + 2363.

It is an arithmetic number, because the mean of its divisors is an integer number (122265).

2^1340406 is an apocalyptic number.

1340406 is an abundant number, since it is smaller than the sum of its proper divisors (1593954).

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

1340406 is a wasteful number, since it uses less digits than its factorization.

1340406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780 (or 777 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 1340406 is about 1157.7590422882. The cubic root of 1340406 is about 110.2585104572.

Adding to 1340406 its reverse (6040431), we get a palindrome (7380837).

The spelling of 1340406 in words is "one million, three hundred forty thousand, four hundred six".