421523900 has 108 divisors (see below), whose sum is σ = 1069275312. Its totient is φ = 141281280.

The previous prime is 421523887. The next prime is 421523909. The reversal of 421523900 is 9325124.

It is a self number, because there is not a number n which added to its sum of digits gives 421523900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421523909) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3730244 + ... + 3730356.

Almost surely, 2^421523900 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 421523900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (534637656).

421523900 is an abundant number, since it is smaller than the sum of its proper divisors (647751412).

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

421523900 is a wasteful number, since it uses less digits than its factorization.

421523900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 421523900 is about 20531.0472212208. The cubic root of 421523900 is about 749.7918829958.

The spelling of 421523900 in words is "four hundred twenty-one million, five hundred twenty-three thousand, nine hundred".