421742191 has 8 divisors (see below), whose sum is σ = 473931360. Its totient is φ = 372374112.

The previous prime is 421742177. The next prime is 421742203. The reversal of 421742191 is 191247124.

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 421742191 - 2⁵ = 421742159 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 (421742141) 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, 704956 + ... + 705553.

It is an arithmetic number, because the mean of its divisors is an integer number (59241420).

Almost surely, 2^421742191 is an apocalyptic number.

421742191 is a deficient number, since it is larger than the sum of its proper divisors (52189169).

421742191 is a wasteful number, since it uses less digits than its factorization.

421742191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410545.

The product of its digits is 4032, while the sum is 31.

The square root of 421742191 is about 20536.3626526218. The cubic root of 421742191 is about 749.9212901103.

The spelling of 421742191 in words is "four hundred twenty-one million, seven hundred forty-two thousand, one hundred ninety-one".