1205671 has 4 divisors (see below), whose sum is σ = 1212112. Its totient is φ = 1199232.

The previous prime is 1205669. The next prime is 1205681. The reversal of 1205671 is 1765021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1765021 = 43 ⋅41047.

It is a cyclic number.

It is not a de Polignac number, because 1205671 - 2¹ = 1205669 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1205681) 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, 2931 + ... + 3316.

It is an arithmetic number, because the mean of its divisors is an integer number (303028).

2^1205671 is an apocalyptic number.

1205671 is a deficient number, since it is larger than the sum of its proper divisors (6441).

1205671 is an equidigital number, since it uses as much as digits as its factorization.

1205671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6440.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 1205671 is about 1098.0305095943. The cubic root of 1205671 is about 106.4329921526.

The spelling of 1205671 in words is "one million, two hundred five thousand, six hundred seventy-one".