421984457 has 4 divisors (see below), whose sum is σ = 427765140. Its totient is φ = 416203776.

The previous prime is 421984439. The next prime is 421984501. The reversal of 421984457 is 754489124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86508601 + 335475856 = 9301^2 + 18316^2 .

It is a cyclic number.

It is not a de Polignac number, because 421984457 - 2²⁶ = 354875593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421986457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2890232 + ... + 2890377.

It is an arithmetic number, because the mean of its divisors is an integer number (106941285).

Almost surely, 2^421984457 is an apocalyptic number.

It is an amenable number.

421984457 is a deficient number, since it is larger than the sum of its proper divisors (5780683).

421984457 is an equidigital number, since it uses as much as digits as its factorization.

421984457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5780682.

The product of its digits is 322560, while the sum is 44.

The square root of 421984457 is about 20542.2602699898. The cubic root of 421984457 is about 750.0648577985.

The spelling of 421984457 in words is "four hundred twenty-one million, nine hundred eighty-four thousand, four hundred fifty-seven".