421776684 has 144 divisors (see below), whose sum is σ = 1257984000. Its totient is φ = 116661888.

The previous prime is 421776671. The next prime is 421776689. The reversal of 421776684 is 486677124.

It is not an unprimeable number, because it can be changed into a prime (421776689) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1764637 + ... + 1764875.

It is an arithmetic number, because the mean of its divisors is an integer number (8736000).

Almost surely, 2^421776684 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 421776684, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (628992000).

421776684 is an abundant number, since it is smaller than the sum of its proper divisors (836207316).

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

421776684 is a wasteful number, since it uses less digits than its factorization.

421776684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 447 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 421776684 is about 20537.2024385017. The cubic root of 421776684 is about 749.9417341402.

The spelling of 421776684 in words is "four hundred twenty-one million, seven hundred seventy-six thousand, six hundred eighty-four".