420457 has 2 divisors, whose sum is σ = 420458. Its totient is φ = 420456.

The previous prime is 420439. The next prime is 420467. The reversal of 420457 is 754024.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212521 + 207936 = 461^2 + 456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-420457 is a prime.

It is not a weakly prime, because it can be changed into another prime (420467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210228 + 210229.

It is an arithmetic number, because the mean of its divisors is an integer number (210229).

2⁴²⁰⁴⁵⁷ is an apocalyptic number.

It is an amenable number.

420457 is a deficient number, since it is larger than the sum of its proper divisors (1).

420457 is an equidigital number, since it uses as much as digits as its factorization.

420457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1120, while the sum is 22.

The square root of 420457 is about 648.4265571366. The cubic root of 420457 is about 74.9158760478.

The spelling of 420457 in words is "four hundred twenty thousand, four hundred fifty-seven".