421604191 has 8 divisors (see below), whose sum is σ = 440811360. Its totient is φ = 402470112.

The previous prime is 421604173. The next prime is 421604201. The reversal of 421604191 is 191406124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421604191 - 2¹⁹ = 421079903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421604111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6300 + ... + 29713.

It is an arithmetic number, because the mean of its divisors is an integer number (55101420).

Almost surely, 2^421604191 is an apocalyptic number.

421604191 is a deficient number, since it is larger than the sum of its proper divisors (19207169).

421604191 is a wasteful number, since it uses less digits than its factorization.

421604191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36545.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 421604191 is about 20533.0024838064. The cubic root of 421604191 is about 749.8394862422.

The spelling of 421604191 in words is "four hundred twenty-one million, six hundred four thousand, one hundred ninety-one".