19906349 has 4 divisors (see below), whose sum is σ = 19964064. Its totient is φ = 19848636.

The previous prime is 19906331. The next prime is 19906351. The reversal of 19906349 is 94360991.

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 an emirpimes, since its reverse is a distinct semiprime: 94360991 = 67 ⋅1408373.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19906349 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 (19906399) 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 3 ways as a sum of consecutive naturals, for example, 28337 + ... + 29030.

It is an arithmetic number, because the mean of its divisors is an integer number (4991016).

Almost surely, 2^19906349 is an apocalyptic number.

It is an amenable number.

19906349 is a deficient number, since it is larger than the sum of its proper divisors (57715).

19906349 is an equidigital number, since it uses as much as digits as its factorization.

19906349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57714.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 19906349 is about 4461.6531689498. The cubic root of 19906349 is about 271.0174187594.

The spelling of 19906349 in words is "nineteen million, nine hundred six thousand, three hundred forty-nine".