16420191 has 8 divisors (see below), whose sum is σ = 21947520. Its totient is φ = 10919832.

The previous prime is 16420189. The next prime is 16420219. The reversal of 16420191 is 19102461.

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

It is not a de Polignac number, because 16420191 - 2¹ = 16420189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16420121) 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, 5275 + ... + 7788.

It is an arithmetic number, because the mean of its divisors is an integer number (2743440).

Almost surely, 2^16420191 is an apocalyptic number.

16420191 is a deficient number, since it is larger than the sum of its proper divisors (5527329).

16420191 is a wasteful number, since it uses less digits than its factorization.

16420191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13485.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 16420191 is about 4052.1834854804. The cubic root of 16420191 is about 254.1710413055.

The spelling of 16420191 in words is "sixteen million, four hundred twenty thousand, one hundred ninety-one".