421406664 has 96 divisors (see below), whose sum is σ = 1230707520. Its totient is φ = 119892864.

The previous prime is 421406663. The next prime is 421406677. The reversal of 421406664 is 466604124.

It is not an unprimeable number, because it can be changed into a prime (421406663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 343957 + ... + 345179.

It is an arithmetic number, because the mean of its divisors is an integer number (12819870).

Almost surely, 2^421406664 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 421406664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (615353760).

421406664 is an abundant number, since it is smaller than the sum of its proper divisors (809300856).

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

421406664 is a wasteful number, since it uses less digits than its factorization.

421406664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1539 (or 1528 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 421406664 is about 20528.1919320723. The cubic root of 421406664 is about 749.7223647932.

The spelling of 421406664 in words is "four hundred twenty-one million, four hundred six thousand, six hundred sixty-four".