421907 has 2 divisors, whose sum is σ = 421908. Its totient is φ = 421906.

The previous prime is 421891. The next prime is 421913. The reversal of 421907 is 709124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421907 - 2⁴ = 421891 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (421987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210953 + 210954.

It is an arithmetic number, because the mean of its divisors is an integer number (210954).

2⁴²¹⁹⁰⁷ is an apocalyptic number.

421907 is a deficient number, since it is larger than the sum of its proper divisors (1).

421907 is an equidigital number, since it uses as much as digits as its factorization.

421907 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 421907 is about 649.5436859827. The cubic root of 421907 is about 75.0018962484.

The spelling of 421907 in words is "four hundred twenty-one thousand, nine hundred seven".