849421 has 4 divisors (see below), whose sum is σ = 857052. Its totient is φ = 841792.

The previous prime is 849419. The next prime is 849427. The reversal of 849421 is 124948.

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 373321 + 476100 = 611^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 849421 - 2¹ = 849419 is a prime.

It is a Duffinian number.

849421 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 849421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (849427) 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 3 ways as a sum of consecutive naturals, for example, 3646 + ... + 3871.

It is an arithmetic number, because the mean of its divisors is an integer number (214263).

2⁸⁴⁹⁴²¹ is an apocalyptic number.

It is an amenable number.

849421 is a deficient number, since it is larger than the sum of its proper divisors (7631).

849421 is a wasteful number, since it uses less digits than its factorization.

849421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7630.

The product of its digits is 2304, while the sum is 28.

The square root of 849421 is about 921.6403853999. The cubic root of 849421 is about 94.7053102719.

It can be divided in two parts, 8494 and 21, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 849421 in words is "eight hundred forty-nine thousand, four hundred twenty-one".