421919 has 6 divisors (see below), whose sum is σ = 433344. Its totient is φ = 410780.

The previous prime is 421913. The next prime is 421943. The reversal of 421919 is 919124.

It is a de Polignac number, because none of the positive numbers 2^k-421919 is a prime.

It is a super-2 number, since 2×421919² = 356031285122, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2114 + ... + 2304.

It is an arithmetic number, because the mean of its divisors is an integer number (72224).

2⁴²¹⁹¹⁹ is an apocalyptic number.

421919 is a deficient number, since it is larger than the sum of its proper divisors (11425).

421919 is an equidigital number, since it uses as much as digits as its factorization.

421919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 238 counting only the distinct ones).

The product of its digits is 648, while the sum is 26.

The square root of 421919 is about 649.5529231710. The cubic root of 421919 is about 75.0026073168.

The spelling of 421919 in words is "four hundred twenty-one thousand, nine hundred nineteen".