1340405 has 8 divisors (see below), whose sum is σ = 1754784. Its totient is φ = 974800.

The previous prime is 1340401. The next prime is 1340407. The reversal of 1340405 is 5040431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1340405 - 2² = 1340401 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 12131 + ... + 12240.

It is an arithmetic number, because the mean of its divisors is an integer number (219348).

2^1340405 is an apocalyptic number.

It is an amenable number.

1340405 is a deficient number, since it is larger than the sum of its proper divisors (414379).

1340405 is a wasteful number, since it uses less digits than its factorization.

1340405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24387.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 1340405 is about 1157.7586104193. The cubic root of 1340405 is about 110.2584830380.

Adding to 1340405 its reverse (5040431), we get a palindrome (6380836).

The spelling of 1340405 in words is "one million, three hundred forty thousand, four hundred five".