421766420 has 12 divisors (see below), whose sum is σ = 885709524. Its totient is φ = 168706560.

The previous prime is 421766399. The next prime is 421766431. The reversal of 421766420 is 24667124.

It can be written as a sum of positive squares in 2 ways, for example, as 106419856 + 315346564 = 10316^2 + 17758^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10544141 + ... + 10544180.

It is an arithmetic number, because the mean of its divisors is an integer number (73809127).

Almost surely, 2^421766420 is an apocalyptic number.

It is an amenable number.

421766420 is an abundant number, since it is smaller than the sum of its proper divisors (463943104).

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

421766420 is a wasteful number, since it uses less digits than its factorization.

421766420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21088330 (or 21088328 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 421766420 is about 20536.9525490030. The cubic root of 421766420 is about 749.9356507754.

The spelling of 421766420 in words is "four hundred twenty-one million, seven hundred sixty-six thousand, four hundred twenty".