1340205 has 16 divisors (see below), whose sum is σ = 2191104. Its totient is φ = 699200.

The previous prime is 1340179. The next prime is 1340221. The reversal of 1340205 is 5020431.

It is not a de Polignac number, because 1340205 - 2⁹ = 1339693 is a prime.

It is a super-2 number, since 2×1340205² = 3592298884050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246 + ... + 1655.

It is an arithmetic number, because the mean of its divisors is an integer number (136944).

2^1340205 is an apocalyptic number.

1340205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1340205 is a deficient number, since it is larger than the sum of its proper divisors (850899).

1340205 is a wasteful number, since it uses less digits than its factorization.

1340205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1956.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 1340205 is about 1157.6722334063. The cubic root of 1340205 is about 110.2529989260.

Adding to 1340205 its reverse (5020431), we get a palindrome (6360636).

The spelling of 1340205 in words is "one million, three hundred forty thousand, two hundred five".