19829421 has 8 divisors (see below), whose sum is σ = 29376960. Its totient is φ = 13219596.

The previous prime is 19829401. The next prime is 19829461. The reversal of 19829421 is 12492891.

It is not a de Polignac number, because 19829421 - 2⁶ = 19829357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19829401) 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, 367185 + ... + 367238.

It is an arithmetic number, because the mean of its divisors is an integer number (3672120).

Almost surely, 2^19829421 is an apocalyptic number.

It is an amenable number.

19829421 is a deficient number, since it is larger than the sum of its proper divisors (9547539).

19829421 is an equidigital number, since it uses as much as digits as its factorization.

19829421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734432 (or 734426 counting only the distinct ones).

The product of its digits is 10368, while the sum is 36.

The square root of 19829421 is about 4453.0238041133. The cubic root of 19829421 is about 270.6678528573.

The spelling of 19829421 in words is "nineteen million, eight hundred twenty-nine thousand, four hundred twenty-one".