420816853 has 2 divisors, whose sum is σ = 420816854. Its totient is φ = 420816852.

The previous prime is 420816841. The next prime is 420816863. The reversal of 420816853 is 358618024.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225991089 + 194825764 = 15033^2 + 13958^2 .

It is a cyclic number.

It is not a de Polignac number, because 420816853 - 2⁵ = 420816821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420816863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210408426 + 210408427.

It is an arithmetic number, because the mean of its divisors is an integer number (210408427).

Almost surely, 2^420816853 is an apocalyptic number.

It is an amenable number.

420816853 is a deficient number, since it is larger than the sum of its proper divisors (1).

420816853 is an equidigital number, since it uses as much as digits as its factorization.

420816853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 420816853 is about 20513.8210238853. The cubic root of 420816853 is about 749.3724249385.

The spelling of 420816853 in words is "four hundred twenty million, eight hundred sixteen thousand, eight hundred fifty-three".