421251408 has 80 divisors (see below), whose sum is σ = 1212898560. Its totient is φ = 139981824.

The previous prime is 421251373. The next prime is 421251433. The reversal of 421251408 is 804152124.

421251408 is a `hidden beast` number, since 4 + 2 + 1 + 251 + 408 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 157216 + ... + 159872.

It is an arithmetic number, because the mean of its divisors is an integer number (15161232).

Almost surely, 2^421251408 is an apocalyptic number.

421251408 is a gapful number since it is divisible by the number (48) 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 421251408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (606449280).

421251408 is an abundant number, since it is smaller than the sum of its proper divisors (791647152).

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

421251408 is a wasteful number, since it uses less digits than its factorization.

421251408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3041 (or 3029 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 27.

The square root of 421251408 is about 20524.4100524229. The cubic root of 421251408 is about 749.6302817745.

The spelling of 421251408 in words is "four hundred twenty-one million, two hundred fifty-one thousand, four hundred eight".