19949641 has 4 divisors (see below), whose sum is σ = 19980484. Its totient is φ = 19918800.

The previous prime is 19949627. The next prime is 19949669. The reversal of 19949641 is 14694991.

It is a happy number.

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 12638025 + 7311616 = 3555^2 + 2704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19949641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19941641) 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, 14430 + ... + 15751.

It is an arithmetic number, because the mean of its divisors is an integer number (4995121).

Almost surely, 2^19949641 is an apocalyptic number.

It is an amenable number.

19949641 is a deficient number, since it is larger than the sum of its proper divisors (30843).

19949641 is an equidigital number, since it uses as much as digits as its factorization.

19949641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30842.

The product of its digits is 69984, while the sum is 43.

The square root of 19949641 is about 4466.5020989584. The cubic root of 19949641 is about 271.2137445791.

The spelling of 19949641 in words is "nineteen million, nine hundred forty-nine thousand, six hundred forty-one".