421861908 has 48 divisors (see below), whose sum is σ = 1067855040. Its totient is φ = 128849664.

The previous prime is 421861903. The next prime is 421861933. The reversal of 421861908 is 809168124.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421861903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11503 + ... + 31241.

It is an arithmetic number, because the mean of its divisors is an integer number (22246980).

Almost surely, 2^421861908 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 421861908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (533927520).

421861908 is an abundant number, since it is smaller than the sum of its proper divisors (645993132).

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

421861908 is a wasteful number, since it uses less digits than its factorization.

421861908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19896 (or 19894 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 421861908 is about 20539.2772024723. The cubic root of 421861908 is about 749.9922416975.

The spelling of 421861908 in words is "four hundred twenty-one million, eight hundred sixty-one thousand, nine hundred eight".