1206621 has 12 divisors (see below), whose sum is σ = 1877148. Its totient is φ = 742464.

The previous prime is 1206619. The next prime is 1206637. The reversal of 1206621 is 1266021.

It is a happy number.

1206621 is a `hidden beast` number, since 1 + 2 + 0 + 662 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 324900 + 881721 = 570^2 + 939^2 .

It is not a de Polignac number, because 1206621 - 2¹ = 1206619 is a prime.

It is a Smith number, since the sum of its digits (18) coincides with the sum of the digits of its prime factors.

1206621 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1206594 and 1206603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1206691) 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 11 ways as a sum of consecutive naturals, for example, 5040 + ... + 5273.

It is an arithmetic number, because the mean of its divisors is an integer number (156429).

2^1206621 is an apocalyptic number.

It is an amenable number.

1206621 is a deficient number, since it is larger than the sum of its proper divisors (670527).

1206621 is a wasteful number, since it uses less digits than its factorization.

1206621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10332 (or 10329 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1206621 is about 1098.4630171289. The cubic root of 1206621 is about 106.4609391900.

The spelling of 1206621 in words is "one million, two hundred six thousand, six hundred twenty-one".