420208457 has 2 divisors, whose sum is σ = 420208458. Its totient is φ = 420208456.

The previous prime is 420208417. The next prime is 420208483. The reversal of 420208457 is 754802024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 392792761 + 27415696 = 19819^2 + 5236^2 .

It is a cyclic number.

It is not a de Polignac number, because 420208457 - 2¹⁰ = 420207433 is a prime.

It is not a weakly prime, because it can be changed into another prime (420208417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210104228 + 210104229.

It is an arithmetic number, because the mean of its divisors is an integer number (210104229).

Almost surely, 2^420208457 is an apocalyptic number.

It is an amenable number.

420208457 is a deficient number, since it is larger than the sum of its proper divisors (1).

420208457 is an equidigital number, since it uses as much as digits as its factorization.

420208457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17920, while the sum is 32.

The square root of 420208457 is about 20498.9867310558. The cubic root of 420208457 is about 749.0111156797.

The spelling of 420208457 in words is "four hundred twenty million, two hundred eight thousand, four hundred fifty-seven".