1606021 has 4 divisors (see below), whose sum is σ = 1675872. Its totient is φ = 1536172.

The previous prime is 1606009. The next prime is 1606081. The reversal of 1606021 is 1206061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1606021 - 2⁹ = 1605509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1605986 and 1606004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34891 + ... + 34936.

It is an arithmetic number, because the mean of its divisors is an integer number (418968).

2^1606021 is an apocalyptic number.

It is an amenable number.

1606021 is a deficient number, since it is larger than the sum of its proper divisors (69851).

1606021 is an equidigital number, since it uses as much as digits as its factorization.

1606021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69850.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1606021 is about 1267.2888384263. The cubic root of 1606021 is about 117.1072384697.

The spelling of 1606021 in words is "one million, six hundred six thousand, twenty-one".