421782417 has 16 divisors (see below), whose sum is σ = 714129280. Its totient is φ = 241018416.

The previous prime is 421782397. The next prime is 421782443. The reversal of 421782417 is 714287124.

It is not a de Polignac number, because 421782417 - 2⁷ = 421782289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421782217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1115638 + ... + 1116015.

It is an arithmetic number, because the mean of its divisors is an integer number (44633080).

Almost surely, 2^421782417 is an apocalyptic number.

It is an amenable number.

421782417 is a deficient number, since it is larger than the sum of its proper divisors (292346863).

421782417 is a wasteful number, since it uses less digits than its factorization.

421782417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2231669 (or 2231663 counting only the distinct ones).

The product of its digits is 25088, while the sum is 36.

The square root of 421782417 is about 20537.3420139998. The cubic root of 421782417 is about 749.9451319861.

The spelling of 421782417 in words is "four hundred twenty-one million, seven hundred eighty-two thousand, four hundred seventeen".