846421 has 2 divisors, whose sum is σ = 846422. Its totient is φ = 846420.

The previous prime is 846407. The next prime is 846427. The reversal of 846421 is 124648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 835396 + 11025 = 914^2 + 105^2 .

It is a cyclic number.

It is not a de Polignac number, because 846421 - 2⁵ = 846389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (846427) 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 as a sum of consecutive naturals, namely, 423210 + 423211.

It is an arithmetic number, because the mean of its divisors is an integer number (423211).

2⁸⁴⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

846421 is a deficient number, since it is larger than the sum of its proper divisors (1).

846421 is an equidigital number, since it uses as much as digits as its factorization.

846421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 25.

The square root of 846421 is about 920.0114129727. The cubic root of 846421 is about 94.5936847958.

The spelling of 846421 in words is "eight hundred forty-six thousand, four hundred twenty-one".