420397 has 2 divisors, whose sum is σ = 420398. Its totient is φ = 420396.

The previous prime is 420383. The next prime is 420419. The reversal of 420397 is 793024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249001 + 171396 = 499^2 + 414^2 .

It is a cyclic number.

It is not a de Polignac number, because 420397 - 2⁷ = 420269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210198 + 210199.

It is an arithmetic number, because the mean of its divisors is an integer number (210199).

2⁴²⁰³⁹⁷ is an apocalyptic number.

It is an amenable number.

420397 is a deficient number, since it is larger than the sum of its proper divisors (1).

420397 is an equidigital number, since it uses as much as digits as its factorization.

420397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 420397 is about 648.3802896449. The cubic root of 420397 is about 74.9123123331.

The spelling of 420397 in words is "four hundred twenty thousand, three hundred ninety-seven".