1321406 has 8 divisors (see below), whose sum is σ = 2046144. Its totient is φ = 639360.

The previous prime is 1321399. The next prime is 1321409. The reversal of 1321406 is 6041231.

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

It is a super-2 number, since 2×1321406² = 3492227633672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321409) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 10595 + ... + 10718.

It is an arithmetic number, because the mean of its divisors is an integer number (255768).

2^1321406 is an apocalyptic number.

1321406 is a deficient number, since it is larger than the sum of its proper divisors (724738).

1321406 is a wasteful number, since it uses less digits than its factorization.

1321406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21346.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1321406 is about 1149.5242494180. The cubic root of 1321406 is about 109.7350648952.

Adding to 1321406 its reverse (6041231), we get a palindrome (7362637).

The spelling of 1321406 in words is "one million, three hundred twenty-one thousand, four hundred six".