19929399 has 8 divisors (see below), whose sum is σ = 30368640. Its totient is φ = 11388216.

The previous prime is 19929397. The next prime is 19929401. The reversal of 19929399 is 99392991.

It is an interprime number because it is at equal distance from previous prime (19929397) and next prime (19929401).

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

It is not a de Polignac number, because 19929399 - 2¹ = 19929397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19929391) 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 7 ways as a sum of consecutive naturals, for example, 474489 + ... + 474530.

It is an arithmetic number, because the mean of its divisors is an integer number (3796080).

Almost surely, 2^19929399 is an apocalyptic number.

19929399 is a deficient number, since it is larger than the sum of its proper divisors (10439241).

19929399 is an equidigital number, since it uses as much as digits as its factorization.

19929399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949029.

The product of its digits is 354294, while the sum is 51.

The square root of 19929399 is about 4464.2355448610. The cubic root of 19929399 is about 271.1219840899.

The spelling of 19929399 in words is "nineteen million, nine hundred twenty-nine thousand, three hundred ninety-nine".