421601544 has 256 divisors, whose sum is σ = 1463616000. Its totient is φ = 109486080.

The previous prime is 421601539. The next prime is 421601563. The reversal of 421601544 is 445106124.

421601544 is a `hidden beast` number, since 4 + 2 + 1 + 601 + 54 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1749264 + ... + 1749504.

It is an arithmetic number, because the mean of its divisors is an integer number (5717250).

Almost surely, 2^421601544 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 421601544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731808000).

421601544 is an abundant number, since it is smaller than the sum of its proper divisors (1042014456).

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

421601544 is a wasteful number, since it uses less digits than its factorization.

421601544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 421601544 is about 20532.9380264978. The cubic root of 421601544 is about 749.8379169746.

Adding to 421601544 its reverse (445106124), we get a palindrome (866707668).

The spelling of 421601544 in words is "four hundred twenty-one million, six hundred one thousand, five hundred forty-four".