421187904 has 112 divisors (see below), whose sum is σ = 1256019840. Its totient is φ = 138378240.

The previous prime is 421187887. The next prime is 421187911. The reversal of 421187904 is 409781124.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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, 120972 + ... + 124404.

Almost surely, 2^421187904 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 421187904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (628009920).

421187904 is an abundant number, since it is smaller than the sum of its proper divisors (834831936).

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

421187904 is a wasteful number, since it uses less digits than its factorization.

421187904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525 (or 3509 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 421187904 is about 20522.8629581742. The cubic root of 421187904 is about 749.5926107521.

The spelling of 421187904 in words is "four hundred twenty-one million, one hundred eighty-seven thousand, nine hundred four".