1206421 has 4 divisors (see below), whose sum is σ = 1208844. Its totient is φ = 1204000.

The previous prime is 1206407. The next prime is 1206433. The reversal of 1206421 is 1246021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 970225 + 236196 = 985^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 1206421 - 2¹³ = 1198229 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1206395 and 1206404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160 + ... + 1561.

It is an arithmetic number, because the mean of its divisors is an integer number (302211).

2^1206421 is an apocalyptic number.

It is an amenable number.

1206421 is a deficient number, since it is larger than the sum of its proper divisors (2423).

1206421 is an equidigital number, since it uses as much as digits as its factorization.

1206421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2422.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1206421 is about 1098.3719770642. The cubic root of 1206421 is about 106.4550568225.

The spelling of 1206421 in words is "one million, two hundred six thousand, four hundred twenty-one".