421525560 has 128 divisors (see below), whose sum is σ = 1304962560. Its totient is φ = 108864000.

The previous prime is 421525553. The next prime is 421525597. The reversal of 421525560 is 65525124.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 778890 + ... + 779430.

It is an arithmetic number, because the mean of its divisors is an integer number (10195020).

Almost surely, 2^421525560 is an apocalyptic number.

421525560 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 421525560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (652481280).

421525560 is an abundant number, since it is smaller than the sum of its proper divisors (883437000).

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

421525560 is a wasteful number, since it uses less digits than its factorization.

421525560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749 (or 745 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 421525560 is about 20531.0876477599. The cubic root of 421525560 is about 749.7928672444.

The spelling of 421525560 in words is "four hundred twenty-one million, five hundred twenty-five thousand, five hundred sixty".