421643436 has 12 divisors (see below), whose sum is σ = 983834712. Its totient is φ = 140547808.

The previous prime is 421643419. The next prime is 421643447. The reversal of 421643436 is 634346124.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 421643397 and 421643406.

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, 17568465 + ... + 17568488.

It is an arithmetic number, because the mean of its divisors is an integer number (81986226).

Almost surely, 2^421643436 is an apocalyptic number.

It is an amenable number.

421643436 is an abundant number, since it is smaller than the sum of its proper divisors (562191276).

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

421643436 is a wasteful number, since it uses less digits than its factorization.

421643436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35136960 (or 35136958 counting only the distinct ones).

The product of its digits is 41472, while the sum is 33.

The square root of 421643436 is about 20533.9581182002. The cubic root of 421643436 is about 749.8627517743.

The spelling of 421643436 in words is "four hundred twenty-one million, six hundred forty-three thousand, four hundred thirty-six".