906021 has 6 divisors (see below), whose sum is σ = 1308710. Its totient is φ = 604008.

The previous prime is 906013. The next prime is 906023. The reversal of 906021 is 120609.

It can be written as a sum of positive squares in only one way, i.e., 893025 + 12996 = 945^2 + 114^2 .

It is not a de Polignac number, because 906021 - 2³ = 906013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 905985 and 906003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (906023) 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 5 ways as a sum of consecutive naturals, for example, 50326 + ... + 50343.

2⁹⁰⁶⁰²¹ is an apocalyptic number.

It is an amenable number.

906021 is a deficient number, since it is larger than the sum of its proper divisors (402689).

906021 is a wasteful number, since it uses less digits than its factorization.

906021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100675 (or 100672 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 906021 is about 951.8513539414. The cubic root of 906021 is about 96.7637642417.

The spelling of 906021 in words is "nine hundred six thousand, twenty-one".