19429909 has 4 divisors (see below), whose sum is σ = 19440000. Its totient is φ = 19419820.

The previous prime is 19429897. The next prime is 19429957. The reversal of 19429909 is 90992491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19429909 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 (19429009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1159 + ... + 6340.

It is an arithmetic number, because the mean of its divisors is an integer number (4860000).

Almost surely, 2^19429909 is an apocalyptic number.

It is an amenable number.

19429909 is a deficient number, since it is larger than the sum of its proper divisors (10091).

19429909 is an equidigital number, since it uses as much as digits as its factorization.

19429909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10090.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 19429909 is about 4407.9370458299. The cubic root of 19429909 is about 268.8377521986.

It can be divided in two parts, 194 and 29909, that added together give a palindrome (30103).

The spelling of 19429909 in words is "nineteen million, four hundred twenty-nine thousand, nine hundred nine".