19949549 has 8 divisors (see below), whose sum is σ = 20966880. Its totient is φ = 18957456.

The previous prime is 19949543. The next prime is 19949561. The reversal of 19949549 is 94594991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19949549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19949497 and 19949506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19949543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4679 + ... + 7860.

It is an arithmetic number, because the mean of its divisors is an integer number (2620860).

Almost surely, 2^19949549 is an apocalyptic number.

It is an amenable number.

19949549 is a deficient number, since it is larger than the sum of its proper divisors (1017331).

19949549 is a wasteful number, since it uses less digits than its factorization.

19949549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12619.

The product of its digits is 524880, while the sum is 50.

The square root of 19949549 is about 4466.4918000596. The cubic root of 19949549 is about 271.2133276677.

The spelling of 19949549 in words is "nineteen million, nine hundred forty-nine thousand, five hundred forty-nine".