19308421 has 8 divisors (see below), whose sum is σ = 21104064. Its totient is φ = 17519520.

The previous prime is 19308361. The next prime is 19308433. The reversal of 19308421 is 12480391.

It is a happy number.

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 19308421 - 2¹⁷ = 19177349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19308421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19302421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5761 + ... + 8473.

It is an arithmetic number, because the mean of its divisors is an integer number (2638008).

Almost surely, 2^19308421 is an apocalyptic number.

19308421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19308421 is a deficient number, since it is larger than the sum of its proper divisors (1795643).

19308421 is a wasteful number, since it uses less digits than its factorization.

19308421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3371.

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

The square root of 19308421 is about 4394.1348408987. The cubic root of 19308421 is about 268.2762661285.

The spelling of 19308421 in words is "nineteen million, three hundred eight thousand, four hundred twenty-one".