421779456 has 216 divisors, whose sum is σ = 1420096860. Its totient is φ = 120250368.

The previous prime is 421779443. The next prime is 421779481. The reversal of 421779456 is 654977124.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 902935 + ... + 903401.

Almost surely, 2^421779456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421779456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (710048430).

421779456 is an abundant number, since it is smaller than the sum of its proper divisors (998317404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421779456 is a wasteful number, since it uses less digits than its factorization.

421779456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 479 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 421779456 is about 20537.2699256742. The cubic root of 421779456 is about 749.9433770586.

The spelling of 421779456 in words is "four hundred twenty-one million, seven hundred seventy-nine thousand, four hundred fifty-six".