909421 has 6 divisors (see below), whose sum is σ = 933866. Its totient is φ = 885600.

The previous prime is 909409. The next prime is 909437. The reversal of 909421 is 124909.

It can be written as a sum of positive squares in 3 ways, for example, as 44521 + 864900 = 211^2 + 930^2 .

It is not a de Polignac number, because 909421 - 2⁹ = 908909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (909401) 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, 1411 + ... + 1951.

2⁹⁰⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

909421 is a deficient number, since it is larger than the sum of its proper divisors (24445).

909421 is an equidigital number, since it uses as much as digits as its factorization.

909421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 623 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 909421 is about 953.6356746683. The cubic root of 909421 is about 96.8846540500.

The spelling of 909421 in words is "nine hundred nine thousand, four hundred twenty-one".