421699 has 2 divisors, whose sum is σ = 421700. Its totient is φ = 421698.

The previous prime is 421697. The next prime is 421703. The reversal of 421699 is 996124.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 421699 - 2¹ = 421697 is a prime.

Together with 421697, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 421699.

It is not a weakly prime, because it can be changed into another prime (421691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210849 + 210850.

It is an arithmetic number, because the mean of its divisors is an integer number (210850).

2⁴²¹⁶⁹⁹ is an apocalyptic number.

421699 is a deficient number, since it is larger than the sum of its proper divisors (1).

421699 is an equidigital number, since it uses as much as digits as its factorization.

421699 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 421699 is about 649.3835538416. The cubic root of 421699 is about 74.9895689197.

The spelling of 421699 in words is "four hundred twenty-one thousand, six hundred ninety-nine".