19914409 has 4 divisors (see below), whose sum is σ = 20097220. Its totient is φ = 19731600.

The previous prime is 19914371. The next prime is 19914449. The reversal of 19914409 is 90441991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17264025 + 2650384 = 4155^2 + 1628^2 .

It is a cyclic number.

It is not a de Polignac number, because 19914409 - 2⁹ = 19913897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19914449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91242 + ... + 91459.

It is an arithmetic number, because the mean of its divisors is an integer number (5024305).

Almost surely, 2^19914409 is an apocalyptic number.

It is an amenable number.

19914409 is a deficient number, since it is larger than the sum of its proper divisors (182811).

19914409 is a wasteful number, since it uses less digits than its factorization.

19914409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182810.

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

The square root of 19914409 is about 4462.5563301767. The cubic root of 19914409 is about 271.0539917751.

It can be divided in two parts, 1991 and 4409, that added together give a square (6400 = 80²).

The spelling of 19914409 in words is "nineteen million, nine hundred fourteen thousand, four hundred nine".