19912429 has 8 divisors (see below), whose sum is σ = 20680632. Its totient is φ = 19157760.

The previous prime is 19912427. The next prime is 19912433. The reversal of 19912429 is 92421991.

It can be written as a sum of positive squares in 4 ways, for example, as 570025 + 19342404 = 755^2 + 4398^2 .

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 19912429 - 2¹ = 19912427 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 (19912421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334 + ... + 6319.

It is an arithmetic number, because the mean of its divisors is an integer number (2585079).

Almost surely, 2^19912429 is an apocalyptic number.

It is an amenable number.

19912429 is a deficient number, since it is larger than the sum of its proper divisors (768203).

19912429 is an equidigital number, since it uses as much as digits as its factorization.

19912429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6767.

The product of its digits is 11664, while the sum is 37.

The square root of 19912429 is about 4462.3344787230. The cubic root of 19912429 is about 271.0450082514.

The spelling of 19912429 in words is "nineteen million, nine hundred twelve thousand, four hundred twenty-nine".