966421 has 4 divisors (see below), whose sum is σ = 972000. Its totient is φ = 960844.

The previous prime is 966419. The next prime is 966431. The reversal of 966421 is 124669.

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 966421 - 2¹ = 966419 is a prime.

It is a Duffinian number.

966421 is a lucky number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 966421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (966401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2521 + ... + 2878.

It is an arithmetic number, because the mean of its divisors is an integer number (243000).

2⁹⁶⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

966421 is a deficient number, since it is larger than the sum of its proper divisors (5579).

966421 is a wasteful number, since it uses less digits than its factorization.

966421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5578.

The product of its digits is 2592, while the sum is 28.

The square root of 966421 is about 983.0671391111. The cubic root of 966421 is about 98.8679325949.

It can be divided in two parts, 9 and 66421, that added together give a triangular number (66430 = T₃₆₄).

The spelling of 966421 in words is "nine hundred sixty-six thousand, four hundred twenty-one".